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Theorem atantan 26769

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 26378	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘𝐴) ≠ 0)
2		atandmtan 26766	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) ∈ dom arctan)
3	1, 2	syldan 590	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) ∈ dom arctan)
4		atanval 26730	. . 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 11174	. . . . . . 7 ⊢ 1 ∈ ℂ
7		ax-icn 11175	. . . . . . . 8 ⊢ i ∈ ℂ
8		tancl 16079	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) ∈ ℂ)
9	1, 8	syldan 590	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) ∈ ℂ)
10		mulcl 11200	. . . . . . . 8 ⊢ ((i ∈ ℂ ∧ (tan‘𝐴) ∈ ℂ) → (i · (tan‘𝐴)) ∈ ℂ)
11	7, 9, 10	sylancr 586	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (tan‘𝐴)) ∈ ℂ)
12		addcl 11198	. . . . . . 7 ⊢ ((1 ∈ ℂ ∧ (i · (tan‘𝐴)) ∈ ℂ) → (1 + (i · (tan‘𝐴))) ∈ ℂ)
13	6, 11, 12	sylancr 586	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 + (i · (tan‘𝐴))) ∈ ℂ)
14		atandm2 26723	. . . . . . . 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 1143	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 + (i · (tan‘𝐴))) ≠ 0)
17	13, 16	logcld 26419	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(1 + (i · (tan‘𝐴)))) ∈ ℂ)
18		subcl 11466	. . . . . . 7 ⊢ ((1 ∈ ℂ ∧ (i · (tan‘𝐴)) ∈ ℂ) → (1 − (i · (tan‘𝐴))) ∈ ℂ)
19	6, 11, 18	sylancr 586	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 − (i · (tan‘𝐴))) ∈ ℂ)
20	15	simp2d 1142	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 − (i · (tan‘𝐴))) ≠ 0)
21	19, 20	logcld 26419	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(1 − (i · (tan‘𝐴)))) ∈ ℂ)
22	17, 21	negsubdi2d 11594	. . . 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 16050	. . . . . . . . 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 583	. . . . . . . 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 16077	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ ℂ → (cos‘𝐴) ∈ ℂ)
26	25	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘𝐴) ∈ ℂ)
27		sincl 16076	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → (sin‘𝐴) ∈ ℂ)
28	27	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (sin‘𝐴) ∈ ℂ)
29		mulcl 11200	. . . . . . . . . . . . 13 ⊢ ((i ∈ ℂ ∧ (sin‘𝐴) ∈ ℂ) → (i · (sin‘𝐴)) ∈ ℂ)
30	7, 28, 29	sylancr 586	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘𝐴)) ∈ ℂ)
31	26, 30, 26, 1	divdird 12035	. . . . . . . . . . 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 11995	. . . . . . . . . . . 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 12032	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · (sin‘𝐴)) / (cos‘𝐴)) = (i · ((sin‘𝐴) / (cos‘𝐴))))
35		tanval 16078	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴)))
36	1, 35	syldan 590	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴)))
37	36	oveq2d 7428	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (tan‘𝐴)) = (i · ((sin‘𝐴) / (cos‘𝐴))))
38	34, 37	eqtr4d 2774	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · (sin‘𝐴)) / (cos‘𝐴)) = (i · (tan‘𝐴)))
39	32, 38	oveq12d 7430	. . . . . . . . . . 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 2771	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) + (i · (sin‘𝐴))) / (cos‘𝐴)) = (1 + (i · (tan‘𝐴))))
41		efival 16102	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ ℂ → (exp‘(i · 𝐴)) = ((cos‘𝐴) + (i · (sin‘𝐴))))
42	41	adantr 480	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · 𝐴)) = ((cos‘𝐴) + (i · (sin‘𝐴))))
43	42	oveq1d 7427	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘(i · 𝐴)) / (cos‘𝐴)) = (((cos‘𝐴) + (i · (sin‘𝐴))) / (cos‘𝐴)))
44		eflog 26425	. . . . . . . . . . 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 583	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(log‘(1 + (i · (tan‘𝐴))))) = (1 + (i · (tan‘𝐴))))
46	40, 43, 45	3eqtr4d 2781	. . . . . . . . 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 12036	. . . . . . . . . . 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 7430	. . . . . . . . . . 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 2771	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((cos‘𝐴) − (i · (sin‘𝐴))) / (cos‘𝐴)) = (1 − (i · (tan‘𝐴))))
50		negcl 11467	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ)
51	50	adantr 480	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -𝐴 ∈ ℂ)
52		efival 16102	. . . . . . . . . . . . . 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 16097	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → (cos‘-𝐴) = (cos‘𝐴))
55	54	adantr 480	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘-𝐴) = (cos‘𝐴))
56		sinneg 16096	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (sin‘-𝐴) = -(sin‘𝐴))
57	56	adantr 480	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (sin‘-𝐴) = -(sin‘𝐴))
58	57	oveq2d 7428	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘-𝐴)) = (i · -(sin‘𝐴)))
59		mulneg2 11658	. . . . . . . . . . . . . . . 16 ⊢ ((i ∈ ℂ ∧ (sin‘𝐴) ∈ ℂ) → (i · -(sin‘𝐴)) = -(i · (sin‘𝐴)))
60	7, 28, 59	sylancr 586	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · -(sin‘𝐴)) = -(i · (sin‘𝐴)))
61	58, 60	eqtrd 2771	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘-𝐴)) = -(i · (sin‘𝐴)))
62	55, 61	oveq12d 7430	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((cos‘-𝐴) + (i · (sin‘-𝐴))) = ((cos‘𝐴) + -(i · (sin‘𝐴))))
63	53, 62	eqtrd 2771	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · -𝐴)) = ((cos‘𝐴) + -(i · (sin‘𝐴))))
64		simpl 482	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 𝐴 ∈ ℂ)
65		mulneg2 11658	. . . . . . . . . . . . . 14 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · -𝐴) = -(i · 𝐴))
66	7, 64, 65	sylancr 586	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · -𝐴) = -(i · 𝐴))
67	66	fveq2d 6895	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · -𝐴)) = (exp‘-(i · 𝐴)))
68	26, 30	negsubd 11584	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((cos‘𝐴) + -(i · (sin‘𝐴))) = ((cos‘𝐴) − (i · (sin‘𝐴))))
69	63, 67, 68	3eqtr3d 2779	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘-(i · 𝐴)) = ((cos‘𝐴) − (i · (sin‘𝐴))))
70	69	oveq1d 7427	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘-(i · 𝐴)) / (cos‘𝐴)) = (((cos‘𝐴) − (i · (sin‘𝐴))) / (cos‘𝐴)))
71		eflog 26425	. . . . . . . . . . 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 583	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(log‘(1 − (i · (tan‘𝐴))))) = (1 − (i · (tan‘𝐴))))
73	49, 70, 72	3eqtr4d 2781	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘-(i · 𝐴)) / (cos‘𝐴)) = (exp‘(log‘(1 − (i · (tan‘𝐴))))))
74	46, 73	oveq12d 7430	. . . . . . . 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 11200	. . . . . . . . . . . 12 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
76	7, 64, 75	sylancr 586	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · 𝐴) ∈ ℂ)
77		efcl 16033	. . . . . . . . . . 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 11565	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -(i · 𝐴) ∈ ℂ)
80		efcl 16033	. . . . . . . . . . 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 16047	. . . . . . . . . . 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 12025	. . . . . . . . 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 16050	. . . . . . . . . 10 ⊢ (((i · 𝐴) ∈ ℂ ∧ -(i · 𝐴) ∈ ℂ) → (exp‘((i · 𝐴) − -(i · 𝐴))) = ((exp‘(i · 𝐴)) / (exp‘-(i · 𝐴))))
86	76, 79, 85	syl2anc 583	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘((i · 𝐴) − -(i · 𝐴))) = ((exp‘(i · 𝐴)) / (exp‘-(i · 𝐴))))
87	76, 76	subnegd 11585	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · 𝐴) − -(i · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
88	76	2timesd 12462	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
89	87, 88	eqtr4d 2774	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · 𝐴) − -(i · 𝐴)) = (2 · (i · 𝐴)))
90	89	fveq2d 6895	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘((i · 𝐴) − -(i · 𝐴))) = (exp‘(2 · (i · 𝐴))))
91	84, 86, 90	3eqtr2d 2777	. . . . . . . 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 2777	. . . . . . 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 6895	. . . . . 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 480	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 𝐴 ∈ ℂ)
95	94	renegd 15163	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-𝐴) = -(ℜ‘𝐴))
96	94	recld 15148	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘𝐴) ∈ ℝ)
97	96	renegcld 11648	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(ℜ‘𝐴) ∈ ℝ)
98		simpr 484	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘𝐴) < 0)
99	96	lt0neg1d 11790	. . . . . . . . . . . . . . . 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 13390	. . . . . . . . . . . . . . . . . . 19 ⊢ ((ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2)) → (-(π / 2) < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2)))
102	101	adantl 481	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-(π / 2) < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2)))
103	102	simpld 494	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -(π / 2) < (ℜ‘𝐴))
104	103	adantr 480	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(π / 2) < (ℜ‘𝐴))
105		halfpire 26314	. . . . . . . . . . . . . . . . 17 ⊢ (π / 2) ∈ ℝ
106		ltnegcon1 11722	. . . . . . . . . . . . . . . . 17 ⊢ (((π / 2) ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (-(π / 2) < (ℜ‘𝐴) ↔ -(ℜ‘𝐴) < (π / 2)))
107	105, 96, 106	sylancr 586	. . . . . . . . . . . . . . . 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 11268	. . . . . . . . . . . . . . . 16 ⊢ 0 ∈ ℝ^*
110	105	rexri 11279	. . . . . . . . . . . . . . . 16 ⊢ (π / 2) ∈ ℝ^*
111		elioo2 13372	. . . . . . . . . . . . . . . 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 689	. . . . . . . . . . . . . . 15 ⊢ (-(ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ (-(ℜ‘𝐴) ∈ ℝ ∧ 0 < -(ℜ‘𝐴) ∧ -(ℜ‘𝐴) < (π / 2)))
113	97, 100, 108, 112	syl3anbrc 1342	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(ℜ‘𝐴) ∈ (0(,)(π / 2)))
114	95, 113	eqeltrd 2832	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-𝐴) ∈ (0(,)(π / 2)))
115		tanregt0 26388	. . . . . . . . . . . . 13 ⊢ ((-𝐴 ∈ ℂ ∧ (ℜ‘-𝐴) ∈ (0(,)(π / 2))) → 0 < (ℜ‘(tan‘-𝐴)))
116	51, 114, 115	syl2an2r 682	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < (ℜ‘(tan‘-𝐴)))
117		tanneg 16098	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘-𝐴) = -(tan‘𝐴))
118	1, 117	syldan 590	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘-𝐴) = -(tan‘𝐴))
119	118	adantr 480	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (tan‘-𝐴) = -(tan‘𝐴))
120	119	fveq2d 6895	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘-𝐴)) = (ℜ‘-(tan‘𝐴)))
121	9	adantr 480	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (tan‘𝐴) ∈ ℂ)
122	121	renegd 15163	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-(tan‘𝐴)) = -(ℜ‘(tan‘𝐴)))
123	120, 122	eqtrd 2771	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘-𝐴)) = -(ℜ‘(tan‘𝐴)))
124	116, 123	breqtrd 5174	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < -(ℜ‘(tan‘𝐴)))
125	9	recld 15148	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘(tan‘𝐴)) ∈ ℝ)
126	125	adantr 480	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘𝐴)) ∈ ℝ)
127	126	lt0neg1d 11790	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → ((ℜ‘(tan‘𝐴)) < 0 ↔ 0 < -(ℜ‘(tan‘𝐴))))
128	124, 127	mpbird 257	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘𝐴)) < 0)
129	128	lt0ne0d 11786	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘𝐴)) ≠ 0)
130		atanlogsub 26762	. . . . . . . . 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 682	. . . . . . . 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 11221	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ
133		ioossre 13392	. . . . . . . . . . . . . 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 480	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ ℂ)
136		ine0 11656	. . . . . . . . . . . . . . . . 17 ⊢ i ≠ 0
137	136	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → i ≠ 0)
138		ixi 11850	. . . . . . . . . . . . . . . . . . 19 ⊢ (i · i) = -1
139	138	oveq1i 7422	. . . . . . . . . . . . . . . . . 18 ⊢ ((i · i) · (tan‘𝐴)) = (-1 · (tan‘𝐴))
140	9	adantr 480	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (tan‘𝐴) ∈ ℂ)
141	140	mulm1d 11673	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (-1 · (tan‘𝐴)) = -(tan‘𝐴))
142	118	adantr 480	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (tan‘-𝐴) = -(tan‘𝐴))
143	141, 142	eqtr4d 2774	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (-1 · (tan‘𝐴)) = (tan‘-𝐴))
144	139, 143	eqtrid 2783	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · (tan‘𝐴)) = (tan‘-𝐴))
145	134, 134, 140	mulassd 11244	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · (tan‘𝐴)) = (i · (i · (tan‘𝐴))))
146	138	oveq1i 7422	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((i · i) · 𝐴) = (-1 · 𝐴)
147	64	adantr 480	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → 𝐴 ∈ ℂ)
148	147	mulm1d 11673	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (-1 · 𝐴) = -𝐴)
149	146, 148	eqtrid 2783	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · 𝐴) = -𝐴)
150	134, 134, 147	mulassd 11244	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · 𝐴) = (i · (i · 𝐴)))
151	149, 150	eqtr3d 2773	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → -𝐴 = (i · (i · 𝐴)))
152	151	fveq2d 6895	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (tan‘-𝐴) = (tan‘(i · (i · 𝐴))))
153	144, 145, 152	3eqtr3d 2779	. . . . . . . . . . . . . . . 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 12053	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) = ((tan‘(i · (i · 𝐴))) / i))
155	76	adantr 480	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ∈ ℂ)
156		reim 15063	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
157	156	adantr 480	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
158	157	eqeq1d 2733	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((ℜ‘𝐴) = 0 ↔ (ℑ‘(i · 𝐴)) = 0))
159	158	biimpa 476	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (ℑ‘(i · 𝐴)) = 0)
160	155, 159	reim0bd 15154	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ∈ ℝ)
161		tanhbnd 16111	. . . . . . . . . . . . . . . 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 2832	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ (-1(,)1))
164	133, 163	sselid 3980	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ ℝ)
165		readdcl 11199	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℝ ∧ (i · (tan‘𝐴)) ∈ ℝ) → (1 + (i · (tan‘𝐴))) ∈ ℝ)
166	132, 164, 165	sylancr 586	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 + (i · (tan‘𝐴))) ∈ ℝ)
167		df-neg 11454	. . . . . . . . . . . . . 14 ⊢ -1 = (0 − 1)
168		eliooord 13390	. . . . . . . . . . . . . . . 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 494	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → -1 < (i · (tan‘𝐴)))
171	167, 170	eqbrtrrid 5184	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (0 − 1) < (i · (tan‘𝐴)))
172		0red 11224	. . . . . . . . . . . . . 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 11819	. . . . . . . . . . . . 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 13020	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 + (i · (tan‘𝐴))) ∈ ℝ⁺)
177	176	relogcld 26471	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (log‘(1 + (i · (tan‘𝐴)))) ∈ ℝ)
178	169	simprd 495	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) < 1)
179		difrp 13019	. . . . . . . . . . . . 13 ⊢ (((i · (tan‘𝐴)) ∈ ℝ ∧ 1 ∈ ℝ) → ((i · (tan‘𝐴)) < 1 ↔ (1 − (i · (tan‘𝐴))) ∈ ℝ⁺))
180	164, 132, 179	sylancl 585	. . . . . . . . . . . 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 26471	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (log‘(1 − (i · (tan‘𝐴)))) ∈ ℝ)
183	177, 182	resubcld 11649	. . . . . . . . 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 26410	. . . . . . . . 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 480	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → 𝐴 ∈ ℂ)
187	186	recld 15148	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘𝐴) ∈ ℝ)
188		simpr 484	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → 0 < (ℜ‘𝐴))
189	102	simprd 495	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘𝐴) < (π / 2))
190	189	adantr 480	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘𝐴) < (π / 2))
191		elioo2 13372	. . . . . . . . . . . . 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 689	. . . . . . . . . . . 12 ⊢ ((ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ ((ℜ‘𝐴) ∈ ℝ ∧ 0 < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2)))
193	187, 188, 190, 192	syl3anbrc 1342	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘𝐴) ∈ (0(,)(π / 2)))
194		tanregt0 26388	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (0(,)(π / 2))) → 0 < (ℜ‘(tan‘𝐴)))
195	64, 193, 194	syl2an2r 682	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → 0 < (ℜ‘(tan‘𝐴)))
196	195	gt0ne0d 11785	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘(tan‘𝐴)) ≠ 0)
197	3, 196, 130	syl2an2r 682	. . . . . . . 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 15064	. . . . . . . . . 10 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) ∈ ℝ)
199	198	adantr 480	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘𝐴) ∈ ℝ)
200		0re 11223	. . . . . . . . 9 ⊢ 0 ∈ ℝ
201		lttri4 11305	. . . . . . . . 9 ⊢ (((ℜ‘𝐴) ∈ ℝ ∧ 0 ∈ ℝ) → ((ℜ‘𝐴) < 0 ∨ (ℜ‘𝐴) = 0 ∨ 0 < (ℜ‘𝐴)))
202	199, 200, 201	sylancl 585	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((ℜ‘𝐴) < 0 ∨ (ℜ‘𝐴) = 0 ∨ 0 < (ℜ‘𝐴)))
203	131, 185, 197, 202	mpjao3dan 1430	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
204		logef 26430	. . . . . . 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 12294	. . . . . . . . 9 ⊢ 2 ∈ ℂ
207		mulcl 11200	. . . . . . . . 9 ⊢ ((2 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (2 · (i · 𝐴)) ∈ ℂ)
208	206, 76, 207	sylancr 586	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) ∈ ℂ)
209		picn 26309	. . . . . . . . . . . 12 ⊢ π ∈ ℂ
210		2ne0 12323	. . . . . . . . . . . 12 ⊢ 2 ≠ 0
211		divneg 11913	. . . . . . . . . . . 12 ⊢ ((π ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → -(π / 2) = (-π / 2))
212	209, 206, 210, 211	mp3an 1460	. . . . . . . . . . 11 ⊢ -(π / 2) = (-π / 2)
213	212, 103	eqbrtrrid 5184	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-π / 2) < (ℜ‘𝐴))
214		pire 26308	. . . . . . . . . . . . 13 ⊢ π ∈ ℝ
215	214	renegcli 11528	. . . . . . . . . . . 12 ⊢ -π ∈ ℝ
216	215	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π ∈ ℝ)
217		2re 12293	. . . . . . . . . . . 12 ⊢ 2 ∈ ℝ
218	217	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 2 ∈ ℝ)
219		2pos 12322	. . . . . . . . . . . 12 ⊢ 0 < 2
220	219	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 0 < 2)
221		ltdivmul 12096	. . . . . . . . . . 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 1373	. . . . . . . . . 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 15091	. . . . . . . . . . 11 ⊢ ((2 ∈ ℝ ∧ (i · 𝐴) ∈ ℂ) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℑ‘(i · 𝐴))))
225	217, 76, 224	sylancr 586	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℑ‘(i · 𝐴))))
226	157	oveq2d 7428	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) = (2 · (ℑ‘(i · 𝐴))))
227	225, 226	eqtr4d 2774	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℜ‘𝐴)))
228	223, 227	breqtrrd 5176	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π < (ℑ‘(2 · (i · 𝐴))))
229		remulcl 11201	. . . . . . . . . . 11 ⊢ ((2 ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (2 · (ℜ‘𝐴)) ∈ ℝ)
230	217, 199, 229	sylancr 586	. . . . . . . . . 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 12095	. . . . . . . . . . . 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 1373	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((2 · (ℜ‘𝐴)) < π ↔ (ℜ‘𝐴) < (π / 2)))
234	189, 233	mpbird 257	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) < π)
235	230, 231, 234	ltled 11369	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) ≤ π)
236	227, 235	eqbrtrd 5170	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) ≤ π)
237		ellogrn 26408	. . . . . . . 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 1342	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) ∈ ran log)
239		logef 26430	. . . . . . 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 2779	. . . . 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 11461	. . . 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 2773	. . 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 7428	. 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 12444	. . . . 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 11244	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((i / 2) · 2) · -(i · 𝐴)) = ((i / 2) · (2 · -(i · 𝐴))))
249	7, 206, 210	divcan1i 11965	. . . . 5 ⊢ ((i / 2) · 2) = i
250	249	oveq1i 7422	. . . 4 ⊢ (((i / 2) · 2) · -(i · 𝐴)) = (i · -(i · 𝐴))
251	33, 33, 51	mulassd 11244	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · i) · -𝐴) = (i · (i · -𝐴)))
252	138	oveq1i 7422	. . . . . 6 ⊢ ((i · i) · -𝐴) = (-1 · -𝐴)
253		mul2neg 11660	. . . . . . . 8 ⊢ ((1 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (-1 · -𝐴) = (1 · 𝐴))
254	6, 64, 253	sylancr 586	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-1 · -𝐴) = (1 · 𝐴))
255		mullid 11220	. . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (1 · 𝐴) = 𝐴)
256	255	adantr 480	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 · 𝐴) = 𝐴)
257	254, 256	eqtrd 2771	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-1 · -𝐴) = 𝐴)
258	252, 257	eqtrid 2783	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · i) · -𝐴) = 𝐴)
259	66	oveq2d 7428	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (i · -𝐴)) = (i · -(i · 𝐴)))
260	251, 258, 259	3eqtr3rd 2780	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · -(i · 𝐴)) = 𝐴)
261	250, 260	eqtrid 2783	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((i / 2) · 2) · -(i · 𝐴)) = 𝐴)
262		mulneg2 11658	. . . . 5 ⊢ ((2 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (2 · -(i · 𝐴)) = -(2 · (i · 𝐴)))
263	206, 76, 262	sylancr 586	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · -(i · 𝐴)) = -(2 · (i · 𝐴)))
264	263	oveq2d 7428	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i / 2) · (2 · -(i · 𝐴))) = ((i / 2) · -(2 · (i · 𝐴))))
265	248, 261, 264	3eqtr3rd 2780	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i / 2) · -(2 · (i · 𝐴))) = 𝐴)
266	5, 244, 265	3eqtrd 2775	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 395 ∨ w3o 1085 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 ≠ wne 2939 class class class wbr 5148 dom cdm 5676 ran crn 5677 ‘cfv 6543 (class class class)co 7412 ℂcc 11114 ℝcr 11115 0cc0 11116 1c1 11117 ici 11118 + caddc 11119 · cmul 11121 ℝ^*cxr 11254 < clt 11255 ≤ cle 11256 − cmin 11451 -cneg 11452 / cdiv 11878 2c2 12274 ℝ⁺crp 12981 (,)cioo 13331 ℜcre 15051 ℑcim 15052 expce 16012 sincsin 16014 cosccos 16015 tanctan 16016 πcpi 16017 logclog 26403 arctancatan 26710

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 ax-inf2 9642 ax-cnex 11172 ax-resscn 11173 ax-1cn 11174 ax-icn 11175 ax-addcl 11176 ax-addrcl 11177 ax-mulcl 11178 ax-mulrcl 11179 ax-mulcom 11180 ax-addass 11181 ax-mulass 11182 ax-distr 11183 ax-i2m1 11184 ax-1ne0 11185 ax-1rid 11186 ax-rnegex 11187 ax-rrecex 11188 ax-cnre 11189 ax-pre-lttri 11190 ax-pre-lttrn 11191 ax-pre-ltadd 11192 ax-pre-mulgt0 11193 ax-pre-sup 11194 ax-addf 11195

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3375 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-tp 4633 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-iin 5000 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-se 5632 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-of 7674 df-om 7860 df-1st 7979 df-2nd 7980 df-supp 8152 df-frecs 8272 df-wrecs 8303 df-recs 8377 df-rdg 8416 df-1o 8472 df-2o 8473 df-er 8709 df-map 8828 df-pm 8829 df-ixp 8898 df-en 8946 df-dom 8947 df-sdom 8948 df-fin 8949 df-fsupp 9368 df-fi 9412 df-sup 9443 df-inf 9444 df-oi 9511 df-card 9940 df-pnf 11257 df-mnf 11258 df-xr 11259 df-ltxr 11260 df-le 11261 df-sub 11453 df-neg 11454 df-div 11879 df-nn 12220 df-2 12282 df-3 12283 df-4 12284 df-5 12285 df-6 12286 df-7 12287 df-8 12288 df-9 12289 df-n0 12480 df-z 12566 df-dec 12685 df-uz 12830 df-q 12940 df-rp 12982 df-xneg 13099 df-xadd 13100 df-xmul 13101 df-ioo 13335 df-ioc 13336 df-ico 13337 df-icc 13338 df-fz 13492 df-fzo 13635 df-fl 13764 df-mod 13842 df-seq 13974 df-exp 14035 df-fac 14241 df-bc 14270 df-hash 14298 df-shft 15021 df-cj 15053 df-re 15054 df-im 15055 df-sqrt 15189 df-abs 15190 df-limsup 15422 df-clim 15439 df-rlim 15440 df-sum 15640 df-ef 16018 df-sin 16020 df-cos 16021 df-tan 16022 df-pi 16023 df-struct 17087 df-sets 17104 df-slot 17122 df-ndx 17134 df-base 17152 df-ress 17181 df-plusg 17217 df-mulr 17218 df-starv 17219 df-sca 17220 df-vsca 17221 df-ip 17222 df-tset 17223 df-ple 17224 df-ds 17226 df-unif 17227 df-hom 17228 df-cco 17229 df-rest 17375 df-topn 17376 df-0g 17394 df-gsum 17395 df-topgen 17396 df-pt 17397 df-prds 17400 df-xrs 17455 df-qtop 17460 df-imas 17461 df-xps 17463 df-mre 17537 df-mrc 17538 df-acs 17540 df-mgm 18571 df-sgrp 18650 df-mnd 18666 df-submnd 18712 df-mulg 18994 df-cntz 19229 df-cmn 19698 df-psmet 21225 df-xmet 21226 df-met 21227 df-bl 21228 df-mopn 21229 df-fbas 21230 df-fg 21231 df-cnfld 21234 df-top 22716 df-topon 22733 df-topsp 22755 df-bases 22769 df-cld 22843 df-ntr 22844 df-cls 22845 df-nei 22922 df-lp 22960 df-perf 22961 df-cn 23051 df-cnp 23052 df-haus 23139 df-tx 23386 df-hmeo 23579 df-fil 23670 df-fm 23762 df-flim 23763 df-flf 23764 df-xms 24146 df-ms 24147 df-tms 24148 df-cncf 24718 df-limc 25715 df-dv 25716 df-log 26405 df-atan 26713

This theorem is referenced by: atantanb 26770 atan1 26774

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