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Theorem atantan 26417

Description: The arctangent function is an inverse to tan. (Contributed by Mario Carneiro, 5-Apr-2015.)

**Assertion**
Ref	Expression
atantan	⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (arctan‘(tan‘𝐴)) = 𝐴)

**Proof of Theorem atantan**
Step	Hyp	Ref	Expression
1		cosne0 26029	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘𝐴) ≠ 0)
2		atandmtan 26414	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) ∈ dom arctan)
3	1, 2	syldan 591	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) ∈ dom arctan)
4		atanval 26378	. . 3 ⊢ ((tan‘𝐴) ∈ dom arctan → (arctan‘(tan‘𝐴)) = ((i / 2) · ((log‘(1 − (i · (tan‘𝐴)))) − (log‘(1 + (i · (tan‘𝐴)))))))
5	3, 4	syl 17	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (arctan‘(tan‘𝐴)) = ((i / 2) · ((log‘(1 − (i · (tan‘𝐴)))) − (log‘(1 + (i · (tan‘𝐴)))))))
6		ax-1cn 11164	. . . . . . 7 ⊢ 1 ∈ ℂ
7		ax-icn 11165	. . . . . . . 8 ⊢ i ∈ ℂ
8		tancl 16068	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) ∈ ℂ)
9	1, 8	syldan 591	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) ∈ ℂ)
10		mulcl 11190	. . . . . . . 8 ⊢ ((i ∈ ℂ ∧ (tan‘𝐴) ∈ ℂ) → (i · (tan‘𝐴)) ∈ ℂ)
11	7, 9, 10	sylancr 587	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (tan‘𝐴)) ∈ ℂ)
12		addcl 11188	. . . . . . 7 ⊢ ((1 ∈ ℂ ∧ (i · (tan‘𝐴)) ∈ ℂ) → (1 + (i · (tan‘𝐴))) ∈ ℂ)
13	6, 11, 12	sylancr 587	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 + (i · (tan‘𝐴))) ∈ ℂ)
14		atandm2 26371	. . . . . . . 8 ⊢ ((tan‘𝐴) ∈ dom arctan ↔ ((tan‘𝐴) ∈ ℂ ∧ (1 − (i · (tan‘𝐴))) ≠ 0 ∧ (1 + (i · (tan‘𝐴))) ≠ 0))
15	3, 14	sylib 217	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((tan‘𝐴) ∈ ℂ ∧ (1 − (i · (tan‘𝐴))) ≠ 0 ∧ (1 + (i · (tan‘𝐴))) ≠ 0))
16	15	simp3d 1144	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 + (i · (tan‘𝐴))) ≠ 0)
17	13, 16	logcld 26070	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(1 + (i · (tan‘𝐴)))) ∈ ℂ)
18		subcl 11455	. . . . . . 7 ⊢ ((1 ∈ ℂ ∧ (i · (tan‘𝐴)) ∈ ℂ) → (1 − (i · (tan‘𝐴))) ∈ ℂ)
19	6, 11, 18	sylancr 587	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 − (i · (tan‘𝐴))) ∈ ℂ)
20	15	simp2d 1143	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 − (i · (tan‘𝐴))) ≠ 0)
21	19, 20	logcld 26070	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(1 − (i · (tan‘𝐴)))) ∈ ℂ)
22	17, 21	negsubdi2d 11583	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) = ((log‘(1 − (i · (tan‘𝐴)))) − (log‘(1 + (i · (tan‘𝐴))))))
23		efsub 16039	. . . . . . . . 9 ⊢ (((log‘(1 + (i · (tan‘𝐴)))) ∈ ℂ ∧ (log‘(1 − (i · (tan‘𝐴)))) ∈ ℂ) → (exp‘((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴)))))) = ((exp‘(log‘(1 + (i · (tan‘𝐴))))) / (exp‘(log‘(1 − (i · (tan‘𝐴)))))))
24	17, 21, 23	syl2anc 584	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴)))))) = ((exp‘(log‘(1 + (i · (tan‘𝐴))))) / (exp‘(log‘(1 − (i · (tan‘𝐴)))))))
25		coscl 16066	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ ℂ → (cos‘𝐴) ∈ ℂ)
26	25	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘𝐴) ∈ ℂ)
27		sincl 16065	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → (sin‘𝐴) ∈ ℂ)
28	27	adantr 481	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (sin‘𝐴) ∈ ℂ)
29		mulcl 11190	. . . . . . . . . . . . 13 ⊢ ((i ∈ ℂ ∧ (sin‘𝐴) ∈ ℂ) → (i · (sin‘𝐴)) ∈ ℂ)
30	7, 28, 29	sylancr 587	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘𝐴)) ∈ ℂ)
31	26, 30, 26, 1	divdird 12024	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) + (i · (sin‘𝐴))) / (cos‘𝐴)) = (((cos‘𝐴) / (cos‘𝐴)) + ((i · (sin‘𝐴)) / (cos‘𝐴))))
32	26, 1	dividd 11984	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((cos‘𝐴) / (cos‘𝐴)) = 1)
33	7	a1i 11	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → i ∈ ℂ)
34	33, 28, 26, 1	divassd 12021	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · (sin‘𝐴)) / (cos‘𝐴)) = (i · ((sin‘𝐴) / (cos‘𝐴))))
35		tanval 16067	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴)))
36	1, 35	syldan 591	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴)))
37	36	oveq2d 7421	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (tan‘𝐴)) = (i · ((sin‘𝐴) / (cos‘𝐴))))
38	34, 37	eqtr4d 2775	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · (sin‘𝐴)) / (cos‘𝐴)) = (i · (tan‘𝐴)))
39	32, 38	oveq12d 7423	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) / (cos‘𝐴)) + ((i · (sin‘𝐴)) / (cos‘𝐴))) = (1 + (i · (tan‘𝐴))))
40	31, 39	eqtrd 2772	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) + (i · (sin‘𝐴))) / (cos‘𝐴)) = (1 + (i · (tan‘𝐴))))
41		efival 16091	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ ℂ → (exp‘(i · 𝐴)) = ((cos‘𝐴) + (i · (sin‘𝐴))))
42	41	adantr 481	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · 𝐴)) = ((cos‘𝐴) + (i · (sin‘𝐴))))
43	42	oveq1d 7420	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘(i · 𝐴)) / (cos‘𝐴)) = (((cos‘𝐴) + (i · (sin‘𝐴))) / (cos‘𝐴)))
44		eflog 26076	. . . . . . . . . . 11 ⊢ (((1 + (i · (tan‘𝐴))) ∈ ℂ ∧ (1 + (i · (tan‘𝐴))) ≠ 0) → (exp‘(log‘(1 + (i · (tan‘𝐴))))) = (1 + (i · (tan‘𝐴))))
45	13, 16, 44	syl2anc 584	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(log‘(1 + (i · (tan‘𝐴))))) = (1 + (i · (tan‘𝐴))))
46	40, 43, 45	3eqtr4d 2782	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘(i · 𝐴)) / (cos‘𝐴)) = (exp‘(log‘(1 + (i · (tan‘𝐴))))))
47	26, 30, 26, 1	divsubdird 12025	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) − (i · (sin‘𝐴))) / (cos‘𝐴)) = (((cos‘𝐴) / (cos‘𝐴)) − ((i · (sin‘𝐴)) / (cos‘𝐴))))
48	32, 38	oveq12d 7423	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) / (cos‘𝐴)) − ((i · (sin‘𝐴)) / (cos‘𝐴))) = (1 − (i · (tan‘𝐴))))
49	47, 48	eqtrd 2772	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) − (i · (sin‘𝐴))) / (cos‘𝐴)) = (1 − (i · (tan‘𝐴))))
50		negcl 11456	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ)
51	50	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -𝐴 ∈ ℂ)
52		efival 16091	. . . . . . . . . . . . . 14 ⊢ (-𝐴 ∈ ℂ → (exp‘(i · -𝐴)) = ((cos‘-𝐴) + (i · (sin‘-𝐴))))
53	51, 52	syl 17	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · -𝐴)) = ((cos‘-𝐴) + (i · (sin‘-𝐴))))
54		cosneg 16086	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → (cos‘-𝐴) = (cos‘𝐴))
55	54	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘-𝐴) = (cos‘𝐴))
56		sinneg 16085	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (sin‘-𝐴) = -(sin‘𝐴))
57	56	adantr 481	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (sin‘-𝐴) = -(sin‘𝐴))
58	57	oveq2d 7421	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘-𝐴)) = (i · -(sin‘𝐴)))
59		mulneg2 11647	. . . . . . . . . . . . . . . 16 ⊢ ((i ∈ ℂ ∧ (sin‘𝐴) ∈ ℂ) → (i · -(sin‘𝐴)) = -(i · (sin‘𝐴)))
60	7, 28, 59	sylancr 587	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · -(sin‘𝐴)) = -(i · (sin‘𝐴)))
61	58, 60	eqtrd 2772	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘-𝐴)) = -(i · (sin‘𝐴)))
62	55, 61	oveq12d 7423	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((cos‘-𝐴) + (i · (sin‘-𝐴))) = ((cos‘𝐴) + -(i · (sin‘𝐴))))
63	53, 62	eqtrd 2772	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · -𝐴)) = ((cos‘𝐴) + -(i · (sin‘𝐴))))
64		simpl 483	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 𝐴 ∈ ℂ)
65		mulneg2 11647	. . . . . . . . . . . . . 14 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · -𝐴) = -(i · 𝐴))
66	7, 64, 65	sylancr 587	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · -𝐴) = -(i · 𝐴))
67	66	fveq2d 6892	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · -𝐴)) = (exp‘-(i · 𝐴)))
68	26, 30	negsubd 11573	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((cos‘𝐴) + -(i · (sin‘𝐴))) = ((cos‘𝐴) − (i · (sin‘𝐴))))
69	63, 67, 68	3eqtr3d 2780	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘-(i · 𝐴)) = ((cos‘𝐴) − (i · (sin‘𝐴))))
70	69	oveq1d 7420	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘-(i · 𝐴)) / (cos‘𝐴)) = (((cos‘𝐴) − (i · (sin‘𝐴))) / (cos‘𝐴)))
71		eflog 26076	. . . . . . . . . . 11 ⊢ (((1 − (i · (tan‘𝐴))) ∈ ℂ ∧ (1 − (i · (tan‘𝐴))) ≠ 0) → (exp‘(log‘(1 − (i · (tan‘𝐴))))) = (1 − (i · (tan‘𝐴))))
72	19, 20, 71	syl2anc 584	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(log‘(1 − (i · (tan‘𝐴))))) = (1 − (i · (tan‘𝐴))))
73	49, 70, 72	3eqtr4d 2782	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘-(i · 𝐴)) / (cos‘𝐴)) = (exp‘(log‘(1 − (i · (tan‘𝐴))))))
74	46, 73	oveq12d 7423	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((exp‘(i · 𝐴)) / (cos‘𝐴)) / ((exp‘-(i · 𝐴)) / (cos‘𝐴))) = ((exp‘(log‘(1 + (i · (tan‘𝐴))))) / (exp‘(log‘(1 − (i · (tan‘𝐴)))))))
75		mulcl 11190	. . . . . . . . . . . 12 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
76	7, 64, 75	sylancr 587	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · 𝐴) ∈ ℂ)
77		efcl 16022	. . . . . . . . . . 11 ⊢ ((i · 𝐴) ∈ ℂ → (exp‘(i · 𝐴)) ∈ ℂ)
78	76, 77	syl 17	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · 𝐴)) ∈ ℂ)
79	76	negcld 11554	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -(i · 𝐴) ∈ ℂ)
80		efcl 16022	. . . . . . . . . . 11 ⊢ (-(i · 𝐴) ∈ ℂ → (exp‘-(i · 𝐴)) ∈ ℂ)
81	79, 80	syl 17	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘-(i · 𝐴)) ∈ ℂ)
82		efne0 16036	. . . . . . . . . . 11 ⊢ (-(i · 𝐴) ∈ ℂ → (exp‘-(i · 𝐴)) ≠ 0)
83	79, 82	syl 17	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘-(i · 𝐴)) ≠ 0)
84	78, 81, 26, 83, 1	divcan7d 12014	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((exp‘(i · 𝐴)) / (cos‘𝐴)) / ((exp‘-(i · 𝐴)) / (cos‘𝐴))) = ((exp‘(i · 𝐴)) / (exp‘-(i · 𝐴))))
85		efsub 16039	. . . . . . . . . 10 ⊢ (((i · 𝐴) ∈ ℂ ∧ -(i · 𝐴) ∈ ℂ) → (exp‘((i · 𝐴) − -(i · 𝐴))) = ((exp‘(i · 𝐴)) / (exp‘-(i · 𝐴))))
86	76, 79, 85	syl2anc 584	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘((i · 𝐴) − -(i · 𝐴))) = ((exp‘(i · 𝐴)) / (exp‘-(i · 𝐴))))
87	76, 76	subnegd 11574	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · 𝐴) − -(i · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
88	76	2timesd 12451	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
89	87, 88	eqtr4d 2775	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · 𝐴) − -(i · 𝐴)) = (2 · (i · 𝐴)))
90	89	fveq2d 6892	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘((i · 𝐴) − -(i · 𝐴))) = (exp‘(2 · (i · 𝐴))))
91	84, 86, 90	3eqtr2d 2778	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((exp‘(i · 𝐴)) / (cos‘𝐴)) / ((exp‘-(i · 𝐴)) / (cos‘𝐴))) = (exp‘(2 · (i · 𝐴))))
92	24, 74, 91	3eqtr2d 2778	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴)))))) = (exp‘(2 · (i · 𝐴))))
93	92	fveq2d 6892	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(exp‘((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))))) = (log‘(exp‘(2 · (i · 𝐴)))))
94	64	adantr 481	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 𝐴 ∈ ℂ)
95	94	renegd 15152	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-𝐴) = -(ℜ‘𝐴))
96	94	recld 15137	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘𝐴) ∈ ℝ)
97	96	renegcld 11637	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(ℜ‘𝐴) ∈ ℝ)
98		simpr 485	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘𝐴) < 0)
99	96	lt0neg1d 11779	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → ((ℜ‘𝐴) < 0 ↔ 0 < -(ℜ‘𝐴)))
100	98, 99	mpbid 231	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < -(ℜ‘𝐴))
101		eliooord 13379	. . . . . . . . . . . . . . . . . . 19 ⊢ ((ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2)) → (-(π / 2) < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2)))
102	101	adantl 482	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-(π / 2) < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2)))
103	102	simpld 495	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -(π / 2) < (ℜ‘𝐴))
104	103	adantr 481	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(π / 2) < (ℜ‘𝐴))
105		halfpire 25965	. . . . . . . . . . . . . . . . 17 ⊢ (π / 2) ∈ ℝ
106		ltnegcon1 11711	. . . . . . . . . . . . . . . . 17 ⊢ (((π / 2) ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (-(π / 2) < (ℜ‘𝐴) ↔ -(ℜ‘𝐴) < (π / 2)))
107	105, 96, 106	sylancr 587	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (-(π / 2) < (ℜ‘𝐴) ↔ -(ℜ‘𝐴) < (π / 2)))
108	104, 107	mpbid 231	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(ℜ‘𝐴) < (π / 2))
109		0xr 11257	. . . . . . . . . . . . . . . 16 ⊢ 0 ∈ ℝ^*
110	105	rexri 11268	. . . . . . . . . . . . . . . 16 ⊢ (π / 2) ∈ ℝ^*
111		elioo2 13361	. . . . . . . . . . . . . . . 16 ⊢ ((0 ∈ ℝ^* ∧ (π / 2) ∈ ℝ^*) → (-(ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ (-(ℜ‘𝐴) ∈ ℝ ∧ 0 < -(ℜ‘𝐴) ∧ -(ℜ‘𝐴) < (π / 2))))
112	109, 110, 111	mp2an 690	. . . . . . . . . . . . . . 15 ⊢ (-(ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ (-(ℜ‘𝐴) ∈ ℝ ∧ 0 < -(ℜ‘𝐴) ∧ -(ℜ‘𝐴) < (π / 2)))
113	97, 100, 108, 112	syl3anbrc 1343	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(ℜ‘𝐴) ∈ (0(,)(π / 2)))
114	95, 113	eqeltrd 2833	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-𝐴) ∈ (0(,)(π / 2)))
115		tanregt0 26039	. . . . . . . . . . . . 13 ⊢ ((-𝐴 ∈ ℂ ∧ (ℜ‘-𝐴) ∈ (0(,)(π / 2))) → 0 < (ℜ‘(tan‘-𝐴)))
116	51, 114, 115	syl2an2r 683	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < (ℜ‘(tan‘-𝐴)))
117		tanneg 16087	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘-𝐴) = -(tan‘𝐴))
118	1, 117	syldan 591	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘-𝐴) = -(tan‘𝐴))
119	118	adantr 481	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (tan‘-𝐴) = -(tan‘𝐴))
120	119	fveq2d 6892	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘-𝐴)) = (ℜ‘-(tan‘𝐴)))
121	9	adantr 481	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (tan‘𝐴) ∈ ℂ)
122	121	renegd 15152	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-(tan‘𝐴)) = -(ℜ‘(tan‘𝐴)))
123	120, 122	eqtrd 2772	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘-𝐴)) = -(ℜ‘(tan‘𝐴)))
124	116, 123	breqtrd 5173	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < -(ℜ‘(tan‘𝐴)))
125	9	recld 15137	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘(tan‘𝐴)) ∈ ℝ)
126	125	adantr 481	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘𝐴)) ∈ ℝ)
127	126	lt0neg1d 11779	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → ((ℜ‘(tan‘𝐴)) < 0 ↔ 0 < -(ℜ‘(tan‘𝐴))))
128	124, 127	mpbird 256	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘𝐴)) < 0)
129	128	lt0ne0d 11775	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘𝐴)) ≠ 0)
130		atanlogsub 26410	. . . . . . . . 9 ⊢ (((tan‘𝐴) ∈ dom arctan ∧ (ℜ‘(tan‘𝐴)) ≠ 0) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
131	3, 129, 130	syl2an2r 683	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
132		1re 11210	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ
133		ioossre 13381	. . . . . . . . . . . . . 14 ⊢ (-1(,)1) ⊆ ℝ
134	7	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → i ∈ ℂ)
135	11	adantr 481	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ ℂ)
136		ine0 11645	. . . . . . . . . . . . . . . . 17 ⊢ i ≠ 0
137	136	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → i ≠ 0)
138		ixi 11839	. . . . . . . . . . . . . . . . . . 19 ⊢ (i · i) = -1
139	138	oveq1i 7415	. . . . . . . . . . . . . . . . . 18 ⊢ ((i · i) · (tan‘𝐴)) = (-1 · (tan‘𝐴))
140	9	adantr 481	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (tan‘𝐴) ∈ ℂ)
141	140	mulm1d 11662	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (-1 · (tan‘𝐴)) = -(tan‘𝐴))
142	118	adantr 481	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (tan‘-𝐴) = -(tan‘𝐴))
143	141, 142	eqtr4d 2775	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (-1 · (tan‘𝐴)) = (tan‘-𝐴))
144	139, 143	eqtrid 2784	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · (tan‘𝐴)) = (tan‘-𝐴))
145	134, 134, 140	mulassd 11233	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · (tan‘𝐴)) = (i · (i · (tan‘𝐴))))
146	138	oveq1i 7415	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((i · i) · 𝐴) = (-1 · 𝐴)
147	64	adantr 481	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → 𝐴 ∈ ℂ)
148	147	mulm1d 11662	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (-1 · 𝐴) = -𝐴)
149	146, 148	eqtrid 2784	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · 𝐴) = -𝐴)
150	134, 134, 147	mulassd 11233	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · 𝐴) = (i · (i · 𝐴)))
151	149, 150	eqtr3d 2774	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → -𝐴 = (i · (i · 𝐴)))
152	151	fveq2d 6892	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (tan‘-𝐴) = (tan‘(i · (i · 𝐴))))
153	144, 145, 152	3eqtr3d 2780	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (i · (tan‘𝐴))) = (tan‘(i · (i · 𝐴))))
154	134, 135, 137, 153	mvllmuld 12042	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) = ((tan‘(i · (i · 𝐴))) / i))
155	76	adantr 481	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ∈ ℂ)
156		reim 15052	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
157	156	adantr 481	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
158	157	eqeq1d 2734	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((ℜ‘𝐴) = 0 ↔ (ℑ‘(i · 𝐴)) = 0))
159	158	biimpa 477	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (ℑ‘(i · 𝐴)) = 0)
160	155, 159	reim0bd 15143	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ∈ ℝ)
161		tanhbnd 16100	. . . . . . . . . . . . . . . 16 ⊢ ((i · 𝐴) ∈ ℝ → ((tan‘(i · (i · 𝐴))) / i) ∈ (-1(,)1))
162	160, 161	syl 17	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((tan‘(i · (i · 𝐴))) / i) ∈ (-1(,)1))
163	154, 162	eqeltrd 2833	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ (-1(,)1))
164	133, 163	sselid 3979	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ ℝ)
165		readdcl 11189	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℝ ∧ (i · (tan‘𝐴)) ∈ ℝ) → (1 + (i · (tan‘𝐴))) ∈ ℝ)
166	132, 164, 165	sylancr 587	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 + (i · (tan‘𝐴))) ∈ ℝ)
167		df-neg 11443	. . . . . . . . . . . . . 14 ⊢ -1 = (0 − 1)
168		eliooord 13379	. . . . . . . . . . . . . . . 16 ⊢ ((i · (tan‘𝐴)) ∈ (-1(,)1) → (-1 < (i · (tan‘𝐴)) ∧ (i · (tan‘𝐴)) < 1))
169	163, 168	syl 17	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (-1 < (i · (tan‘𝐴)) ∧ (i · (tan‘𝐴)) < 1))
170	169	simpld 495	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → -1 < (i · (tan‘𝐴)))
171	167, 170	eqbrtrrid 5183	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (0 − 1) < (i · (tan‘𝐴)))
172		0red 11213	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → 0 ∈ ℝ)
173	132	a1i 11	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → 1 ∈ ℝ)
174	172, 173, 164	ltsubadd2d 11808	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((0 − 1) < (i · (tan‘𝐴)) ↔ 0 < (1 + (i · (tan‘𝐴)))))
175	171, 174	mpbid 231	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → 0 < (1 + (i · (tan‘𝐴))))
176	166, 175	elrpd 13009	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 + (i · (tan‘𝐴))) ∈ ℝ⁺)
177	176	relogcld 26122	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (log‘(1 + (i · (tan‘𝐴)))) ∈ ℝ)
178	169	simprd 496	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) < 1)
179		difrp 13008	. . . . . . . . . . . . 13 ⊢ (((i · (tan‘𝐴)) ∈ ℝ ∧ 1 ∈ ℝ) → ((i · (tan‘𝐴)) < 1 ↔ (1 − (i · (tan‘𝐴))) ∈ ℝ⁺))
180	164, 132, 179	sylancl 586	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · (tan‘𝐴)) < 1 ↔ (1 − (i · (tan‘𝐴))) ∈ ℝ⁺))
181	178, 180	mpbid 231	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 − (i · (tan‘𝐴))) ∈ ℝ⁺)
182	181	relogcld 26122	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (log‘(1 − (i · (tan‘𝐴)))) ∈ ℝ)
183	177, 182	resubcld 11638	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ℝ)
184		relogrn 26061	. . . . . . . . 9 ⊢ (((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ℝ → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
185	183, 184	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
186	64	adantr 481	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → 𝐴 ∈ ℂ)
187	186	recld 15137	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘𝐴) ∈ ℝ)
188		simpr 485	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → 0 < (ℜ‘𝐴))
189	102	simprd 496	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘𝐴) < (π / 2))
190	189	adantr 481	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘𝐴) < (π / 2))
191		elioo2 13361	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ^* ∧ (π / 2) ∈ ℝ^*) → ((ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ ((ℜ‘𝐴) ∈ ℝ ∧ 0 < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2))))
192	109, 110, 191	mp2an 690	. . . . . . . . . . . 12 ⊢ ((ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ ((ℜ‘𝐴) ∈ ℝ ∧ 0 < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2)))
193	187, 188, 190, 192	syl3anbrc 1343	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘𝐴) ∈ (0(,)(π / 2)))
194		tanregt0 26039	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (0(,)(π / 2))) → 0 < (ℜ‘(tan‘𝐴)))
195	64, 193, 194	syl2an2r 683	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → 0 < (ℜ‘(tan‘𝐴)))
196	195	gt0ne0d 11774	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘(tan‘𝐴)) ≠ 0)
197	3, 196, 130	syl2an2r 683	. . . . . . . 8 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
198		recl 15053	. . . . . . . . . 10 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) ∈ ℝ)
199	198	adantr 481	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘𝐴) ∈ ℝ)
200		0re 11212	. . . . . . . . 9 ⊢ 0 ∈ ℝ
201		lttri4 11294	. . . . . . . . 9 ⊢ (((ℜ‘𝐴) ∈ ℝ ∧ 0 ∈ ℝ) → ((ℜ‘𝐴) < 0 ∨ (ℜ‘𝐴) = 0 ∨ 0 < (ℜ‘𝐴)))
202	199, 200, 201	sylancl 586	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((ℜ‘𝐴) < 0 ∨ (ℜ‘𝐴) = 0 ∨ 0 < (ℜ‘𝐴)))
203	131, 185, 197, 202	mpjao3dan 1431	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
204		logef 26081	. . . . . . 7 ⊢ (((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log → (log‘(exp‘((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))))) = ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))))
205	203, 204	syl 17	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(exp‘((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))))) = ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))))
206		2cn 12283	. . . . . . . . 9 ⊢ 2 ∈ ℂ
207		mulcl 11190	. . . . . . . . 9 ⊢ ((2 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (2 · (i · 𝐴)) ∈ ℂ)
208	206, 76, 207	sylancr 587	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) ∈ ℂ)
209		picn 25960	. . . . . . . . . . . 12 ⊢ π ∈ ℂ
210		2ne0 12312	. . . . . . . . . . . 12 ⊢ 2 ≠ 0
211		divneg 11902	. . . . . . . . . . . 12 ⊢ ((π ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → -(π / 2) = (-π / 2))
212	209, 206, 210, 211	mp3an 1461	. . . . . . . . . . 11 ⊢ -(π / 2) = (-π / 2)
213	212, 103	eqbrtrrid 5183	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-π / 2) < (ℜ‘𝐴))
214		pire 25959	. . . . . . . . . . . . 13 ⊢ π ∈ ℝ
215	214	renegcli 11517	. . . . . . . . . . . 12 ⊢ -π ∈ ℝ
216	215	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π ∈ ℝ)
217		2re 12282	. . . . . . . . . . . 12 ⊢ 2 ∈ ℝ
218	217	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 2 ∈ ℝ)
219		2pos 12311	. . . . . . . . . . . 12 ⊢ 0 < 2
220	219	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 0 < 2)
221		ltdivmul 12085	. . . . . . . . . . 11 ⊢ ((-π ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((-π / 2) < (ℜ‘𝐴) ↔ -π < (2 · (ℜ‘𝐴))))
222	216, 199, 218, 220, 221	syl112anc 1374	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((-π / 2) < (ℜ‘𝐴) ↔ -π < (2 · (ℜ‘𝐴))))
223	213, 222	mpbid 231	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π < (2 · (ℜ‘𝐴)))
224		immul2 15080	. . . . . . . . . . 11 ⊢ ((2 ∈ ℝ ∧ (i · 𝐴) ∈ ℂ) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℑ‘(i · 𝐴))))
225	217, 76, 224	sylancr 587	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℑ‘(i · 𝐴))))
226	157	oveq2d 7421	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) = (2 · (ℑ‘(i · 𝐴))))
227	225, 226	eqtr4d 2775	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℜ‘𝐴)))
228	223, 227	breqtrrd 5175	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π < (ℑ‘(2 · (i · 𝐴))))
229		remulcl 11191	. . . . . . . . . . 11 ⊢ ((2 ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (2 · (ℜ‘𝐴)) ∈ ℝ)
230	217, 199, 229	sylancr 587	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) ∈ ℝ)
231	214	a1i 11	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → π ∈ ℝ)
232		ltmuldiv2 12084	. . . . . . . . . . . 12 ⊢ (((ℜ‘𝐴) ∈ ℝ ∧ π ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((2 · (ℜ‘𝐴)) < π ↔ (ℜ‘𝐴) < (π / 2)))
233	199, 231, 218, 220, 232	syl112anc 1374	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((2 · (ℜ‘𝐴)) < π ↔ (ℜ‘𝐴) < (π / 2)))
234	189, 233	mpbird 256	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) < π)
235	230, 231, 234	ltled 11358	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) ≤ π)
236	227, 235	eqbrtrd 5169	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) ≤ π)
237		ellogrn 26059	. . . . . . . 8 ⊢ ((2 · (i · 𝐴)) ∈ ran log ↔ ((2 · (i · 𝐴)) ∈ ℂ ∧ -π < (ℑ‘(2 · (i · 𝐴))) ∧ (ℑ‘(2 · (i · 𝐴))) ≤ π))
238	208, 228, 236, 237	syl3anbrc 1343	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) ∈ ran log)
239		logef 26081	. . . . . . 7 ⊢ ((2 · (i · 𝐴)) ∈ ran log → (log‘(exp‘(2 · (i · 𝐴)))) = (2 · (i · 𝐴)))
240	238, 239	syl 17	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(exp‘(2 · (i · 𝐴)))) = (2 · (i · 𝐴)))
241	93, 205, 240	3eqtr3d 2780	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) = (2 · (i · 𝐴)))
242	241	negeqd 11450	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) = -(2 · (i · 𝐴)))
243	22, 242	eqtr3d 2774	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((log‘(1 − (i · (tan‘𝐴)))) − (log‘(1 + (i · (tan‘𝐴))))) = -(2 · (i · 𝐴)))
244	243	oveq2d 7421	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i / 2) · ((log‘(1 − (i · (tan‘𝐴)))) − (log‘(1 + (i · (tan‘𝐴)))))) = ((i / 2) · -(2 · (i · 𝐴))))
245		halfcl 12433	. . . . 5 ⊢ (i ∈ ℂ → (i / 2) ∈ ℂ)
246	7, 245	mp1i 13	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i / 2) ∈ ℂ)
247	206	a1i 11	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 2 ∈ ℂ)
248	246, 247, 79	mulassd 11233	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((i / 2) · 2) · -(i · 𝐴)) = ((i / 2) · (2 · -(i · 𝐴))))
249	7, 206, 210	divcan1i 11954	. . . . 5 ⊢ ((i / 2) · 2) = i
250	249	oveq1i 7415	. . . 4 ⊢ (((i / 2) · 2) · -(i · 𝐴)) = (i · -(i · 𝐴))
251	33, 33, 51	mulassd 11233	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · i) · -𝐴) = (i · (i · -𝐴)))
252	138	oveq1i 7415	. . . . . 6 ⊢ ((i · i) · -𝐴) = (-1 · -𝐴)
253		mul2neg 11649	. . . . . . . 8 ⊢ ((1 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (-1 · -𝐴) = (1 · 𝐴))
254	6, 64, 253	sylancr 587	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-1 · -𝐴) = (1 · 𝐴))
255		mullid 11209	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (1 · 𝐴) = 𝐴)
256	255	adantr 481	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 · 𝐴) = 𝐴)
257	254, 256	eqtrd 2772	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-1 · -𝐴) = 𝐴)
258	252, 257	eqtrid 2784	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · i) · -𝐴) = 𝐴)
259	66	oveq2d 7421	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (i · -𝐴)) = (i · -(i · 𝐴)))
260	251, 258, 259	3eqtr3rd 2781	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · -(i · 𝐴)) = 𝐴)
261	250, 260	eqtrid 2784	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((i / 2) · 2) · -(i · 𝐴)) = 𝐴)
262		mulneg2 11647	. . . . 5 ⊢ ((2 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (2 · -(i · 𝐴)) = -(2 · (i · 𝐴)))
263	206, 76, 262	sylancr 587	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · -(i · 𝐴)) = -(2 · (i · 𝐴)))
264	263	oveq2d 7421	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i / 2) · (2 · -(i · 𝐴))) = ((i / 2) · -(2 · (i · 𝐴))))
265	248, 261, 264	3eqtr3rd 2781	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i / 2) · -(2 · (i · 𝐴))) = 𝐴)
266	5, 244, 265	3eqtrd 2776	1 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (arctan‘(tan‘𝐴)) = 𝐴)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∨ w3o 1086 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 class class class wbr 5147 dom cdm 5675 ran crn 5676 ‘cfv 6540 (class class class)co 7405 ℂcc 11104 ℝcr 11105 0cc0 11106 1c1 11107 ici 11108 + caddc 11109 · cmul 11111 ℝ^*cxr 11243 < clt 11244 ≤ cle 11245 − cmin 11440 -cneg 11441 / cdiv 11867 2c2 12263 ℝ⁺crp 12970 (,)cioo 13320 ℜcre 15040 ℑcim 15041 expce 16001 sincsin 16003 cosccos 16004 tanctan 16005 πcpi 16006 logclog 26054 arctancatan 26358

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-inf2 9632 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183 ax-pre-sup 11184 ax-addf 11185 ax-mulf 11186

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-iin 4999 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-se 5631 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7666 df-om 7852 df-1st 7971 df-2nd 7972 df-supp 8143 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 df-er 8699 df-map 8818 df-pm 8819 df-ixp 8888 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fsupp 9358 df-fi 9402 df-sup 9433 df-inf 9434 df-oi 9501 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-div 11868 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-q 12929 df-rp 12971 df-xneg 13088 df-xadd 13089 df-xmul 13090 df-ioo 13324 df-ioc 13325 df-ico 13326 df-icc 13327 df-fz 13481 df-fzo 13624 df-fl 13753 df-mod 13831 df-seq 13963 df-exp 14024 df-fac 14230 df-bc 14259 df-hash 14287 df-shft 15010 df-cj 15042 df-re 15043 df-im 15044 df-sqrt 15178 df-abs 15179 df-limsup 15411 df-clim 15428 df-rlim 15429 df-sum 15629 df-ef 16007 df-sin 16009 df-cos 16010 df-tan 16011 df-pi 16012 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-starv 17208 df-sca 17209 df-vsca 17210 df-ip 17211 df-tset 17212 df-ple 17213 df-ds 17215 df-unif 17216 df-hom 17217 df-cco 17218 df-rest 17364 df-topn 17365 df-0g 17383 df-gsum 17384 df-topgen 17385 df-pt 17386 df-prds 17389 df-xrs 17444 df-qtop 17449 df-imas 17450 df-xps 17452 df-mre 17526 df-mrc 17527 df-acs 17529 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-submnd 18668 df-mulg 18945 df-cntz 19175 df-cmn 19644 df-psmet 20928 df-xmet 20929 df-met 20930 df-bl 20931 df-mopn 20932 df-fbas 20933 df-fg 20934 df-cnfld 20937 df-top 22387 df-topon 22404 df-topsp 22426 df-bases 22440 df-cld 22514 df-ntr 22515 df-cls 22516 df-nei 22593 df-lp 22631 df-perf 22632 df-cn 22722 df-cnp 22723 df-haus 22810 df-tx 23057 df-hmeo 23250 df-fil 23341 df-fm 23433 df-flim 23434 df-flf 23435 df-xms 23817 df-ms 23818 df-tms 23819 df-cncf 24385 df-limc 25374 df-dv 25375 df-log 26056 df-atan 26361

This theorem is referenced by: atantanb 26418 atan1 26422

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