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Theorem atantan 26901

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 26506	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘𝐴) ≠ 0)
2		atandmtan 26898	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) ∈ dom arctan)
3	1, 2	syldan 592	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) ∈ dom arctan)
4		atanval 26862	. . 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 11096	. . . . . . 7 ⊢ 1 ∈ ℂ
7		ax-icn 11097	. . . . . . . 8 ⊢ i ∈ ℂ
8		tancl 16066	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) ∈ ℂ)
9	1, 8	syldan 592	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) ∈ ℂ)
10		mulcl 11122	. . . . . . . 8 ⊢ ((i ∈ ℂ ∧ (tan‘𝐴) ∈ ℂ) → (i · (tan‘𝐴)) ∈ ℂ)
11	7, 9, 10	sylancr 588	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (tan‘𝐴)) ∈ ℂ)
12		addcl 11120	. . . . . . 7 ⊢ ((1 ∈ ℂ ∧ (i · (tan‘𝐴)) ∈ ℂ) → (1 + (i · (tan‘𝐴))) ∈ ℂ)
13	6, 11, 12	sylancr 588	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 + (i · (tan‘𝐴))) ∈ ℂ)
14		atandm2 26855	. . . . . . . 8 ⊢ ((tan‘𝐴) ∈ dom arctan ↔ ((tan‘𝐴) ∈ ℂ ∧ (1 − (i · (tan‘𝐴))) ≠ 0 ∧ (1 + (i · (tan‘𝐴))) ≠ 0))
15	3, 14	sylib 218	. . . . . . 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 1145	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 + (i · (tan‘𝐴))) ≠ 0)
17	13, 16	logcld 26547	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(1 + (i · (tan‘𝐴)))) ∈ ℂ)
18		subcl 11391	. . . . . . 7 ⊢ ((1 ∈ ℂ ∧ (i · (tan‘𝐴)) ∈ ℂ) → (1 − (i · (tan‘𝐴))) ∈ ℂ)
19	6, 11, 18	sylancr 588	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 − (i · (tan‘𝐴))) ∈ ℂ)
20	15	simp2d 1144	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (1 − (i · (tan‘𝐴))) ≠ 0)
21	19, 20	logcld 26547	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (log‘(1 − (i · (tan‘𝐴)))) ∈ ℂ)
22	17, 21	negsubdi2d 11520	. . . 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 16037	. . . . . . . . 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 585	. . . . . . . 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 16064	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ ℂ → (cos‘𝐴) ∈ ℂ)
26	25	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (cos‘𝐴) ∈ ℂ)
27		sincl 16063	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → (sin‘𝐴) ∈ ℂ)
28	27	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (sin‘𝐴) ∈ ℂ)
29		mulcl 11122	. . . . . . . . . . . . 13 ⊢ ((i ∈ ℂ ∧ (sin‘𝐴) ∈ ℂ) → (i · (sin‘𝐴)) ∈ ℂ)
30	7, 28, 29	sylancr 588	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘𝐴)) ∈ ℂ)
31	26, 30, 26, 1	divdird 11967	. . . . . . . . . . 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 11927	. . . . . . . . . . . 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 11964	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · (sin‘𝐴)) / (cos‘𝐴)) = (i · ((sin‘𝐴) / (cos‘𝐴))))
35		tanval 16065	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴)))
36	1, 35	syldan 592	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴)))
37	36	oveq2d 7384	. . . . . . . . . . . . 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 7386	. . . . . . . . . . 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 16089	. . . . . . . . . . . 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 7383	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘(i · 𝐴)) / (cos‘𝐴)) = (((cos‘𝐴) + (i · (sin‘𝐴))) / (cos‘𝐴)))
44		eflog 26553	. . . . . . . . . . 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 585	. . . . . . . . . 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 11968	. . . . . . . . . . 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 7386	. . . . . . . . . . 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 11392	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ)
51	50	adantr 480	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -𝐴 ∈ ℂ)
52		efival 16089	. . . . . . . . . . . . . 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 16084	. . . . . . . . . . . . . . 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 16083	. . . . . . . . . . . . . . . . 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 7384	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · (sin‘-𝐴)) = (i · -(sin‘𝐴)))
59		mulneg2 11586	. . . . . . . . . . . . . . . 16 ⊢ ((i ∈ ℂ ∧ (sin‘𝐴) ∈ ℂ) → (i · -(sin‘𝐴)) = -(i · (sin‘𝐴)))
60	7, 28, 59	sylancr 588	. . . . . . . . . . . . . . 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 7386	. . . . . . . . . . . . 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 482	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 𝐴 ∈ ℂ)
65		mulneg2 11586	. . . . . . . . . . . . . 14 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · -𝐴) = -(i · 𝐴))
66	7, 64, 65	sylancr 588	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · -𝐴) = -(i · 𝐴))
67	66	fveq2d 6846	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘(i · -𝐴)) = (exp‘-(i · 𝐴)))
68	26, 30	negsubd 11510	. . . . . . . . . . . 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 7383	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((exp‘-(i · 𝐴)) / (cos‘𝐴)) = (((cos‘𝐴) − (i · (sin‘𝐴))) / (cos‘𝐴)))
71		eflog 26553	. . . . . . . . . . 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 585	. . . . . . . . . 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 7386	. . . . . . . 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 11122	. . . . . . . . . . . 12 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
76	7, 64, 75	sylancr 588	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (i · 𝐴) ∈ ℂ)
77		efcl 16017	. . . . . . . . . . 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 11491	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -(i · 𝐴) ∈ ℂ)
80		efcl 16017	. . . . . . . . . . 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 16033	. . . . . . . . . . 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 11957	. . . . . . . . 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 16037	. . . . . . . . . 10 ⊢ (((i · 𝐴) ∈ ℂ ∧ -(i · 𝐴) ∈ ℂ) → (exp‘((i · 𝐴) − -(i · 𝐴))) = ((exp‘(i · 𝐴)) / (exp‘-(i · 𝐴))))
86	76, 79, 85	syl2anc 585	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (exp‘((i · 𝐴) − -(i · 𝐴))) = ((exp‘(i · 𝐴)) / (exp‘-(i · 𝐴))))
87	76, 76	subnegd 11511	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · 𝐴) − -(i · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
88	76	2timesd 12396	. . . . . . . . . . 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 6846	. . . . . . . . 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 6846	. . . . . 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 15144	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-𝐴) = -(ℜ‘𝐴))
96	94	recld 15129	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘𝐴) ∈ ℝ)
97	96	renegcld 11576	. . . . . . . . . . . . . . 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 11718	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → ((ℜ‘𝐴) < 0 ↔ 0 < -(ℜ‘𝐴)))
100	98, 99	mpbid 232	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < -(ℜ‘𝐴))
101		eliooord 13333	. . . . . . . . . . . . . . . . . . 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 26441	. . . . . . . . . . . . . . . . 17 ⊢ (π / 2) ∈ ℝ
106		ltnegcon1 11650	. . . . . . . . . . . . . . . . 17 ⊢ (((π / 2) ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (-(π / 2) < (ℜ‘𝐴) ↔ -(ℜ‘𝐴) < (π / 2)))
107	105, 96, 106	sylancr 588	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (-(π / 2) < (ℜ‘𝐴) ↔ -(ℜ‘𝐴) < (π / 2)))
108	104, 107	mpbid 232	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(ℜ‘𝐴) < (π / 2))
109		0xr 11191	. . . . . . . . . . . . . . . 16 ⊢ 0 ∈ ℝ^*
110	105	rexri 11202	. . . . . . . . . . . . . . . 16 ⊢ (π / 2) ∈ ℝ^*
111		elioo2 13314	. . . . . . . . . . . . . . . 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 693	. . . . . . . . . . . . . . 15 ⊢ (-(ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ (-(ℜ‘𝐴) ∈ ℝ ∧ 0 < -(ℜ‘𝐴) ∧ -(ℜ‘𝐴) < (π / 2)))
113	97, 100, 108, 112	syl3anbrc 1345	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → -(ℜ‘𝐴) ∈ (0(,)(π / 2)))
114	95, 113	eqeltrd 2837	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘-𝐴) ∈ (0(,)(π / 2)))
115		tanregt0 26516	. . . . . . . . . . . . 13 ⊢ ((-𝐴 ∈ ℂ ∧ (ℜ‘-𝐴) ∈ (0(,)(π / 2))) → 0 < (ℜ‘(tan‘-𝐴)))
116	51, 114, 115	syl2an2r 686	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < (ℜ‘(tan‘-𝐴)))
117		tanneg 16085	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘-𝐴) = -(tan‘𝐴))
118	1, 117	syldan 592	. . . . . . . . . . . . . . 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 6846	. . . . . . . . . . . . 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 15144	. . . . . . . . . . . . 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 5126	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → 0 < -(ℜ‘(tan‘𝐴)))
125	9	recld 15129	. . . . . . . . . . . . 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 11718	. . . . . . . . . . 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 11714	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) < 0) → (ℜ‘(tan‘𝐴)) ≠ 0)
130		atanlogsub 26894	. . . . . . . . 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 686	. . . . . . . 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 11144	. . . . . . . . . . . . 13 ⊢ 1 ∈ ℝ
133		ioossre 13335	. . . . . . . . . . . . . 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 11584	. . . . . . . . . . . . . . . . 17 ⊢ i ≠ 0
137	136	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → i ≠ 0)
138		ixi 11778	. . . . . . . . . . . . . . . . . . 19 ⊢ (i · i) = -1
139	138	oveq1i 7378	. . . . . . . . . . . . . . . . . 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 11601	. . . . . . . . . . . . . . . . . . 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 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 11167	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → ((i · i) · (tan‘𝐴)) = (i · (i · (tan‘𝐴))))
146	138	oveq1i 7378	. . . . . . . . . . . . . . . . . . . 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 11601	. . . . . . . . . . . . . . . . . . . 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 11167	. . . . . . . . . . . . . . . . . . 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 6846	. . . . . . . . . . . . . . . . 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 11985	. . . . . . . . . . . . . . 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 15044	. . . . . . . . . . . . . . . . . . . 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 2739	. . . . . . . . . . . . . . . . . 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 15135	. . . . . . . . . . . . . . . 16 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · 𝐴) ∈ ℝ)
161		tanhbnd 16098	. . . . . . . . . . . . . . . 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 2837	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ (-1(,)1))
164	133, 163	sselid 3933	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (i · (tan‘𝐴)) ∈ ℝ)
165		readdcl 11121	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℝ ∧ (i · (tan‘𝐴)) ∈ ℝ) → (1 + (i · (tan‘𝐴))) ∈ ℝ)
166	132, 164, 165	sylancr 588	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 + (i · (tan‘𝐴))) ∈ ℝ)
167		df-neg 11379	. . . . . . . . . . . . . 14 ⊢ -1 = (0 − 1)
168		eliooord 13333	. . . . . . . . . . . . . . . 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 5136	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (0 − 1) < (i · (tan‘𝐴)))
172		0red 11147	. . . . . . . . . . . . . 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 11747	. . . . . . . . . . . . 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 232	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → 0 < (1 + (i · (tan‘𝐴))))
176	166, 175	elrpd 12958	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 + (i · (tan‘𝐴))) ∈ ℝ⁺)
177	176	relogcld 26600	. . . . . . . . . 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 12957	. . . . . . . . . . . . 13 ⊢ (((i · (tan‘𝐴)) ∈ ℝ ∧ 1 ∈ ℝ) → ((i · (tan‘𝐴)) < 1 ↔ (1 − (i · (tan‘𝐴))) ∈ ℝ⁺))
180	164, 132, 179	sylancl 587	. . . . . . . . . . . 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 232	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (1 − (i · (tan‘𝐴))) ∈ ℝ⁺)
182	181	relogcld 26600	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ (ℜ‘𝐴) = 0) → (log‘(1 − (i · (tan‘𝐴)))) ∈ ℝ)
183	177, 182	resubcld 11577	. . . . . . . . 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 26538	. . . . . . . . 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 15129	. . . . . . . . . . . 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 13314	. . . . . . . . . . . . 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 693	. . . . . . . . . . . 12 ⊢ ((ℜ‘𝐴) ∈ (0(,)(π / 2)) ↔ ((ℜ‘𝐴) ∈ ℝ ∧ 0 < (ℜ‘𝐴) ∧ (ℜ‘𝐴) < (π / 2)))
193	187, 188, 190, 192	syl3anbrc 1345	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘𝐴) ∈ (0(,)(π / 2)))
194		tanregt0 26516	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (0(,)(π / 2))) → 0 < (ℜ‘(tan‘𝐴)))
195	64, 193, 194	syl2an2r 686	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → 0 < (ℜ‘(tan‘𝐴)))
196	195	gt0ne0d 11713	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) ∧ 0 < (ℜ‘𝐴)) → (ℜ‘(tan‘𝐴)) ≠ 0)
197	3, 196, 130	syl2an2r 686	. . . . . . . 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 15045	. . . . . . . . . 10 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) ∈ ℝ)
199	198	adantr 480	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℜ‘𝐴) ∈ ℝ)
200		0re 11146	. . . . . . . . 9 ⊢ 0 ∈ ℝ
201		lttri4 11229	. . . . . . . . 9 ⊢ (((ℜ‘𝐴) ∈ ℝ ∧ 0 ∈ ℝ) → ((ℜ‘𝐴) < 0 ∨ (ℜ‘𝐴) = 0 ∨ 0 < (ℜ‘𝐴)))
202	199, 200, 201	sylancl 587	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((ℜ‘𝐴) < 0 ∨ (ℜ‘𝐴) = 0 ∨ 0 < (ℜ‘𝐴)))
203	131, 185, 197, 202	mpjao3dan 1435	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((log‘(1 + (i · (tan‘𝐴)))) − (log‘(1 − (i · (tan‘𝐴))))) ∈ ran log)
204		logef 26558	. . . . . . 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 12232	. . . . . . . . 9 ⊢ 2 ∈ ℂ
207		mulcl 11122	. . . . . . . . 9 ⊢ ((2 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (2 · (i · 𝐴)) ∈ ℂ)
208	206, 76, 207	sylancr 588	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) ∈ ℂ)
209		picn 26435	. . . . . . . . . . . 12 ⊢ π ∈ ℂ
210		2ne0 12261	. . . . . . . . . . . 12 ⊢ 2 ≠ 0
211		divneg 11845	. . . . . . . . . . . 12 ⊢ ((π ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → -(π / 2) = (-π / 2))
212	209, 206, 210, 211	mp3an 1464	. . . . . . . . . . 11 ⊢ -(π / 2) = (-π / 2)
213	212, 103	eqbrtrrid 5136	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-π / 2) < (ℜ‘𝐴))
214		pire 26434	. . . . . . . . . . . . 13 ⊢ π ∈ ℝ
215	214	renegcli 11454	. . . . . . . . . . . 12 ⊢ -π ∈ ℝ
216	215	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π ∈ ℝ)
217		2re 12231	. . . . . . . . . . . 12 ⊢ 2 ∈ ℝ
218	217	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 2 ∈ ℝ)
219		2pos 12260	. . . . . . . . . . . 12 ⊢ 0 < 2
220	219	a1i 11	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → 0 < 2)
221		ltdivmul 12029	. . . . . . . . . . 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 1377	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((-π / 2) < (ℜ‘𝐴) ↔ -π < (2 · (ℜ‘𝐴))))
223	213, 222	mpbid 232	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π < (2 · (ℜ‘𝐴)))
224		immul2 15072	. . . . . . . . . . 11 ⊢ ((2 ∈ ℝ ∧ (i · 𝐴) ∈ ℂ) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℑ‘(i · 𝐴))))
225	217, 76, 224	sylancr 588	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) = (2 · (ℑ‘(i · 𝐴))))
226	157	oveq2d 7384	. . . . . . . . . 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 5128	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → -π < (ℑ‘(2 · (i · 𝐴))))
229		remulcl 11123	. . . . . . . . . . 11 ⊢ ((2 ∈ ℝ ∧ (ℜ‘𝐴) ∈ ℝ) → (2 · (ℜ‘𝐴)) ∈ ℝ)
230	217, 199, 229	sylancr 588	. . . . . . . . . 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 12028	. . . . . . . . . . . 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 1377	. . . . . . . . . . 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 11293	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (ℜ‘𝐴)) ≤ π)
236	227, 235	eqbrtrd 5122	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (ℑ‘(2 · (i · 𝐴))) ≤ π)
237		ellogrn 26536	. . . . . . . 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 1345	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · (i · 𝐴)) ∈ ran log)
239		logef 26558	. . . . . . 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 11386	. . . 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 7384	. 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 12379	. . . . 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 11167	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (((i / 2) · 2) · -(i · 𝐴)) = ((i / 2) · (2 · -(i · 𝐴))))
249	7, 206, 210	divcan1i 11897	. . . . 5 ⊢ ((i / 2) · 2) = i
250	249	oveq1i 7378	. . . 4 ⊢ (((i / 2) · 2) · -(i · 𝐴)) = (i · -(i · 𝐴))
251	33, 33, 51	mulassd 11167	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → ((i · i) · -𝐴) = (i · (i · -𝐴)))
252	138	oveq1i 7378	. . . . . 6 ⊢ ((i · i) · -𝐴) = (-1 · -𝐴)
253		mul2neg 11588	. . . . . . . 8 ⊢ ((1 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (-1 · -𝐴) = (1 · 𝐴))
254	6, 64, 253	sylancr 588	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (-1 · -𝐴) = (1 · 𝐴))
255		mullid 11143	. . . . . . . 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 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 7384	. . . . 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 11586	. . . . 5 ⊢ ((2 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (2 · -(i · 𝐴)) = -(2 · (i · 𝐴)))
263	206, 76, 262	sylancr 588	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ∈ (-(π / 2)(,)(π / 2))) → (2 · -(i · 𝐴)) = -(2 · (i · 𝐴)))
264	263	oveq2d 7384	. . 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 206 ∧ wa 395 ∨ w3o 1086 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 class class class wbr 5100 dom cdm 5632 ran crn 5633 ‘cfv 6500 (class class class)co 7368 ℂcc 11036 ℝcr 11037 0cc0 11038 1c1 11039 ici 11040 + caddc 11041 · cmul 11043 ℝ^*cxr 11177 < clt 11178 ≤ cle 11179 − cmin 11376 -cneg 11377 / cdiv 11806 2c2 12212 ℝ⁺crp 12917 (,)cioo 13273 ℜcre 15032 ℑcim 15033 expce 15996 sincsin 15998 cosccos 15999 tanctan 16000 πcpi 16001 logclog 26531 arctancatan 26842

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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-inf2 9562 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 ax-pre-sup 11116 ax-addf 11117

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-iin 4951 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-se 5586 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-isom 6509 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-of 7632 df-om 7819 df-1st 7943 df-2nd 7944 df-supp 8113 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-2o 8408 df-er 8645 df-map 8777 df-pm 8778 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-fsupp 9277 df-fi 9326 df-sup 9357 df-inf 9358 df-oi 9427 df-card 9863 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-div 11807 df-nn 12158 df-2 12220 df-3 12221 df-4 12222 df-5 12223 df-6 12224 df-7 12225 df-8 12226 df-9 12227 df-n0 12414 df-z 12501 df-dec 12620 df-uz 12764 df-q 12874 df-rp 12918 df-xneg 13038 df-xadd 13039 df-xmul 13040 df-ioo 13277 df-ioc 13278 df-ico 13279 df-icc 13280 df-fz 13436 df-fzo 13583 df-fl 13724 df-mod 13802 df-seq 13937 df-exp 13997 df-fac 14209 df-bc 14238 df-hash 14266 df-shft 15002 df-cj 15034 df-re 15035 df-im 15036 df-sqrt 15170 df-abs 15171 df-limsup 15406 df-clim 15423 df-rlim 15424 df-sum 15622 df-ef 16002 df-sin 16004 df-cos 16005 df-tan 16006 df-pi 16007 df-struct 17086 df-sets 17103 df-slot 17121 df-ndx 17133 df-base 17149 df-ress 17170 df-plusg 17202 df-mulr 17203 df-starv 17204 df-sca 17205 df-vsca 17206 df-ip 17207 df-tset 17208 df-ple 17209 df-ds 17211 df-unif 17212 df-hom 17213 df-cco 17214 df-rest 17354 df-topn 17355 df-0g 17373 df-gsum 17374 df-topgen 17375 df-pt 17376 df-prds 17379 df-xrs 17435 df-qtop 17440 df-imas 17441 df-xps 17443 df-mre 17517 df-mrc 17518 df-acs 17520 df-mgm 18577 df-sgrp 18656 df-mnd 18672 df-submnd 18721 df-mulg 19010 df-cntz 19258 df-cmn 19723 df-psmet 21313 df-xmet 21314 df-met 21315 df-bl 21316 df-mopn 21317 df-fbas 21318 df-fg 21319 df-cnfld 21322 df-top 22850 df-topon 22867 df-topsp 22889 df-bases 22902 df-cld 22975 df-ntr 22976 df-cls 22977 df-nei 23054 df-lp 23092 df-perf 23093 df-cn 23183 df-cnp 23184 df-haus 23271 df-tx 23518 df-hmeo 23711 df-fil 23802 df-fm 23894 df-flim 23895 df-flf 23896 df-xms 24276 df-ms 24277 df-tms 24278 df-cncf 24839 df-limc 25835 df-dv 25836 df-log 26533 df-atan 26845

This theorem is referenced by: atantanb 26902 atan1 26906

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