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Theorem atancj 24637

Description: The arctangent function distributes under conjugation. (The condition that ℜ(𝐴) ≠ 0 is necessary because the branch cuts are chosen so that the negative imaginary line "agrees with" neighboring values with negative real part, while the positive imaginary line agrees with values with positive real part. This makes atanneg 24634 true unconditionally but messes up conjugation symmetry, and it is impossible to have both in a single-valued function. The claim is true on the imaginary line between -1 and 1, though.) (Contributed by Mario Carneiro, 31-Mar-2015.)

**Assertion**
Ref	Expression
atancj	⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (𝐴 ∈ dom arctan ∧ (∗‘(arctan‘𝐴)) = (arctan‘(∗‘𝐴))))

**Proof of Theorem atancj**
Step	Hyp	Ref	Expression
1		simpl 473	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ∈ ℂ)
2		simpr 477	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) ≠ 0)
3		fveq2 6191	. . . . . 6 ⊢ (𝐴 = -i → (ℜ‘𝐴) = (ℜ‘-i))
4		ax-icn 9995	. . . . . . . 8 ⊢ i ∈ ℂ
5	4	renegi 13920	. . . . . . 7 ⊢ (ℜ‘-i) = -(ℜ‘i)
6		rei 13896	. . . . . . . 8 ⊢ (ℜ‘i) = 0
7	6	negeqi 10274	. . . . . . 7 ⊢ -(ℜ‘i) = -0
8		neg0 10327	. . . . . . 7 ⊢ -0 = 0
9	5, 7, 8	3eqtri 2648	. . . . . 6 ⊢ (ℜ‘-i) = 0
10	3, 9	syl6eq 2672	. . . . 5 ⊢ (𝐴 = -i → (ℜ‘𝐴) = 0)
11	10	necon3i 2826	. . . 4 ⊢ ((ℜ‘𝐴) ≠ 0 → 𝐴 ≠ -i)
12	2, 11	syl 17	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ≠ -i)
13		fveq2 6191	. . . . . 6 ⊢ (𝐴 = i → (ℜ‘𝐴) = (ℜ‘i))
14	13, 6	syl6eq 2672	. . . . 5 ⊢ (𝐴 = i → (ℜ‘𝐴) = 0)
15	14	necon3i 2826	. . . 4 ⊢ ((ℜ‘𝐴) ≠ 0 → 𝐴 ≠ i)
16	2, 15	syl 17	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ≠ i)
17		atandm 24603	. . 3 ⊢ (𝐴 ∈ dom arctan ↔ (𝐴 ∈ ℂ ∧ 𝐴 ≠ -i ∧ 𝐴 ≠ i))
18	1, 12, 16, 17	syl3anbrc 1246	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → 𝐴 ∈ dom arctan)
19		halfcl 11257	. . . . . 6 ⊢ (i ∈ ℂ → (i / 2) ∈ ℂ)
20	4, 19	ax-mp 5	. . . . 5 ⊢ (i / 2) ∈ ℂ
21		ax-1cn 9994	. . . . . . . 8 ⊢ 1 ∈ ℂ
22		mulcl 10020	. . . . . . . . 9 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
23	4, 1, 22	sylancr 695	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (i · 𝐴) ∈ ℂ)
24		subcl 10280	. . . . . . . 8 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (1 − (i · 𝐴)) ∈ ℂ)
25	21, 23, 24	sylancr 695	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · 𝐴)) ∈ ℂ)
26		atandm2 24604	. . . . . . . . 9 ⊢ (𝐴 ∈ dom arctan ↔ (𝐴 ∈ ℂ ∧ (1 − (i · 𝐴)) ≠ 0 ∧ (1 + (i · 𝐴)) ≠ 0))
27	18, 26	sylib 208	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (𝐴 ∈ ℂ ∧ (1 − (i · 𝐴)) ≠ 0 ∧ (1 + (i · 𝐴)) ≠ 0))
28	27	simp2d 1074	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · 𝐴)) ≠ 0)
29	25, 28	logcld 24317	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 − (i · 𝐴))) ∈ ℂ)
30		addcl 10018	. . . . . . . 8 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (1 + (i · 𝐴)) ∈ ℂ)
31	21, 23, 30	sylancr 695	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · 𝐴)) ∈ ℂ)
32	27	simp3d 1075	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · 𝐴)) ≠ 0)
33	31, 32	logcld 24317	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 + (i · 𝐴))) ∈ ℂ)
34	29, 33	subcld 10392	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))) ∈ ℂ)
35		cjmul 13882	. . . . 5 ⊢ (((i / 2) ∈ ℂ ∧ ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))) ∈ ℂ) → (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
36	20, 34, 35	sylancr 695	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
37		2ne0 11113	. . . . . . . 8 ⊢ 2 ≠ 0
38		2cn 11091	. . . . . . . . 9 ⊢ 2 ∈ ℂ
39	4, 38	cjdivi 13931	. . . . . . . 8 ⊢ (2 ≠ 0 → (∗‘(i / 2)) = ((∗‘i) / (∗‘2)))
40	37, 39	ax-mp 5	. . . . . . 7 ⊢ (∗‘(i / 2)) = ((∗‘i) / (∗‘2))
41		divneg 10719	. . . . . . . . 9 ⊢ ((i ∈ ℂ ∧ 2 ∈ ℂ ∧ 2 ≠ 0) → -(i / 2) = (-i / 2))
42	4, 38, 37, 41	mp3an 1424	. . . . . . . 8 ⊢ -(i / 2) = (-i / 2)
43		cji 13899	. . . . . . . . 9 ⊢ (∗‘i) = -i
44		2re 11090	. . . . . . . . . 10 ⊢ 2 ∈ ℝ
45		cjre 13879	. . . . . . . . . 10 ⊢ (2 ∈ ℝ → (∗‘2) = 2)
46	44, 45	ax-mp 5	. . . . . . . . 9 ⊢ (∗‘2) = 2
47	43, 46	oveq12i 6662	. . . . . . . 8 ⊢ ((∗‘i) / (∗‘2)) = (-i / 2)
48	42, 47	eqtr4i 2647	. . . . . . 7 ⊢ -(i / 2) = ((∗‘i) / (∗‘2))
49	40, 48	eqtr4i 2647	. . . . . 6 ⊢ (∗‘(i / 2)) = -(i / 2)
50	49	oveq1i 6660	. . . . 5 ⊢ ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = (-(i / 2) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))))
51	34	cjcld 13936	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) ∈ ℂ)
52		mulneg12 10468	. . . . . 6 ⊢ (((i / 2) ∈ ℂ ∧ (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) ∈ ℂ) → (-(i / 2) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
53	20, 51, 52	sylancr 695	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (-(i / 2) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
54	50, 53	syl5eq 2668	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘(i / 2)) · (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
55		cjsub 13889	. . . . . . . . 9 ⊢ (((log‘(1 − (i · 𝐴))) ∈ ℂ ∧ (log‘(1 + (i · 𝐴))) ∈ ℂ) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((∗‘(log‘(1 − (i · 𝐴)))) − (∗‘(log‘(1 + (i · 𝐴))))))
56	29, 33, 55	syl2anc 693	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((∗‘(log‘(1 − (i · 𝐴)))) − (∗‘(log‘(1 + (i · 𝐴))))))
57		imsub 13875	. . . . . . . . . . . . . . 15 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (ℑ‘(1 − (i · 𝐴))) = ((ℑ‘1) − (ℑ‘(i · 𝐴))))
58	21, 23, 57	sylancr 695	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) = ((ℑ‘1) − (ℑ‘(i · 𝐴))))
59		reim 13849	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
60	59	adantr 481	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) = (ℑ‘(i · 𝐴)))
61	60	oveq2d 6666	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((ℑ‘1) − (ℜ‘𝐴)) = ((ℑ‘1) − (ℑ‘(i · 𝐴))))
62	58, 61	eqtr4d 2659	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) = ((ℑ‘1) − (ℜ‘𝐴)))
63		df-neg 10269	. . . . . . . . . . . . . 14 ⊢ -(ℜ‘𝐴) = (0 − (ℜ‘𝐴))
64		im1 13895	. . . . . . . . . . . . . . 15 ⊢ (ℑ‘1) = 0
65	64	oveq1i 6660	. . . . . . . . . . . . . 14 ⊢ ((ℑ‘1) − (ℜ‘𝐴)) = (0 − (ℜ‘𝐴))
66	63, 65	eqtr4i 2647	. . . . . . . . . . . . 13 ⊢ -(ℜ‘𝐴) = ((ℑ‘1) − (ℜ‘𝐴))
67	62, 66	syl6eqr 2674	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) = -(ℜ‘𝐴))
68		recl 13850	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → (ℜ‘𝐴) ∈ ℝ)
69	68	adantr 481	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) ∈ ℝ)
70	69	recnd 10068	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℜ‘𝐴) ∈ ℂ)
71	70, 2	negne0d 10390	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -(ℜ‘𝐴) ≠ 0)
72	67, 71	eqnetrd 2861	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 − (i · 𝐴))) ≠ 0)
73		logcj 24352	. . . . . . . . . . 11 ⊢ (((1 − (i · 𝐴)) ∈ ℂ ∧ (ℑ‘(1 − (i · 𝐴))) ≠ 0) → (log‘(∗‘(1 − (i · 𝐴)))) = (∗‘(log‘(1 − (i · 𝐴)))))
74	25, 72, 73	syl2anc 693	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 − (i · 𝐴)))) = (∗‘(log‘(1 − (i · 𝐴)))))
75		cjsub 13889	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (∗‘(1 − (i · 𝐴))) = ((∗‘1) − (∗‘(i · 𝐴))))
76	21, 23, 75	sylancr 695	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 − (i · 𝐴))) = ((∗‘1) − (∗‘(i · 𝐴))))
77		1re 10039	. . . . . . . . . . . . . 14 ⊢ 1 ∈ ℝ
78		cjre 13879	. . . . . . . . . . . . . 14 ⊢ (1 ∈ ℝ → (∗‘1) = 1)
79	77, 78	mp1i 13	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘1) = 1)
80		cjmul 13882	. . . . . . . . . . . . . . 15 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (∗‘(i · 𝐴)) = ((∗‘i) · (∗‘𝐴)))
81	4, 1, 80	sylancr 695	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(i · 𝐴)) = ((∗‘i) · (∗‘𝐴)))
82	43	oveq1i 6660	. . . . . . . . . . . . . . 15 ⊢ ((∗‘i) · (∗‘𝐴)) = (-i · (∗‘𝐴))
83		cjcl 13845	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (∗‘𝐴) ∈ ℂ)
84	83	adantr 481	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘𝐴) ∈ ℂ)
85		mulneg1 10466	. . . . . . . . . . . . . . . 16 ⊢ ((i ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (-i · (∗‘𝐴)) = -(i · (∗‘𝐴)))
86	4, 84, 85	sylancr 695	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (-i · (∗‘𝐴)) = -(i · (∗‘𝐴)))
87	82, 86	syl5eq 2668	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘i) · (∗‘𝐴)) = -(i · (∗‘𝐴)))
88	81, 87	eqtrd 2656	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(i · 𝐴)) = -(i · (∗‘𝐴)))
89	79, 88	oveq12d 6668	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘1) − (∗‘(i · 𝐴))) = (1 − -(i · (∗‘𝐴))))
90		mulcl 10020	. . . . . . . . . . . . . 14 ⊢ ((i ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (i · (∗‘𝐴)) ∈ ℂ)
91	4, 84, 90	sylancr 695	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (i · (∗‘𝐴)) ∈ ℂ)
92		subneg 10330	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 − -(i · (∗‘𝐴))) = (1 + (i · (∗‘𝐴))))
93	21, 91, 92	sylancr 695	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − -(i · (∗‘𝐴))) = (1 + (i · (∗‘𝐴))))
94	76, 89, 93	3eqtrd 2660	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 − (i · 𝐴))) = (1 + (i · (∗‘𝐴))))
95	94	fveq2d 6195	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 − (i · 𝐴)))) = (log‘(1 + (i · (∗‘𝐴)))))
96	74, 95	eqtr3d 2658	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(log‘(1 − (i · 𝐴)))) = (log‘(1 + (i · (∗‘𝐴)))))
97		imadd 13874	. . . . . . . . . . . . . 14 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (ℑ‘(1 + (i · 𝐴))) = ((ℑ‘1) + (ℑ‘(i · 𝐴))))
98	21, 23, 97	sylancr 695	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 + (i · 𝐴))) = ((ℑ‘1) + (ℑ‘(i · 𝐴))))
99	60	oveq2d 6666	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (0 + (ℜ‘𝐴)) = (0 + (ℑ‘(i · 𝐴))))
100	64	oveq1i 6660	. . . . . . . . . . . . . 14 ⊢ ((ℑ‘1) + (ℑ‘(i · 𝐴))) = (0 + (ℑ‘(i · 𝐴)))
101	99, 100	syl6eqr 2674	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (0 + (ℜ‘𝐴)) = ((ℑ‘1) + (ℑ‘(i · 𝐴))))
102	70	addid2d 10237	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (0 + (ℜ‘𝐴)) = (ℜ‘𝐴))
103	98, 101, 102	3eqtr2d 2662	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 + (i · 𝐴))) = (ℜ‘𝐴))
104	103, 2	eqnetrd 2861	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (ℑ‘(1 + (i · 𝐴))) ≠ 0)
105		logcj 24352	. . . . . . . . . . 11 ⊢ (((1 + (i · 𝐴)) ∈ ℂ ∧ (ℑ‘(1 + (i · 𝐴))) ≠ 0) → (log‘(∗‘(1 + (i · 𝐴)))) = (∗‘(log‘(1 + (i · 𝐴)))))
106	31, 104, 105	syl2anc 693	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 + (i · 𝐴)))) = (∗‘(log‘(1 + (i · 𝐴)))))
107		cjadd 13881	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (∗‘(1 + (i · 𝐴))) = ((∗‘1) + (∗‘(i · 𝐴))))
108	21, 23, 107	sylancr 695	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 + (i · 𝐴))) = ((∗‘1) + (∗‘(i · 𝐴))))
109	79, 88	oveq12d 6668	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘1) + (∗‘(i · 𝐴))) = (1 + -(i · (∗‘𝐴))))
110		negsub 10329	. . . . . . . . . . . . 13 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 + -(i · (∗‘𝐴))) = (1 − (i · (∗‘𝐴))))
111	21, 91, 110	sylancr 695	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + -(i · (∗‘𝐴))) = (1 − (i · (∗‘𝐴))))
112	108, 109, 111	3eqtrd 2660	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(1 + (i · 𝐴))) = (1 − (i · (∗‘𝐴))))
113	112	fveq2d 6195	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(∗‘(1 + (i · 𝐴)))) = (log‘(1 − (i · (∗‘𝐴)))))
114	106, 113	eqtr3d 2658	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(log‘(1 + (i · 𝐴)))) = (log‘(1 − (i · (∗‘𝐴)))))
115	96, 114	oveq12d 6668	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((∗‘(log‘(1 − (i · 𝐴)))) − (∗‘(log‘(1 + (i · 𝐴))))) = ((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))))
116	56, 115	eqtrd 2656	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))))
117	116	negeqd 10275	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = -((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))))
118		addcl 10018	. . . . . . . . 9 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 + (i · (∗‘𝐴))) ∈ ℂ)
119	21, 91, 118	sylancr 695	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · (∗‘𝐴))) ∈ ℂ)
120		atandmcj 24636	. . . . . . . . . 10 ⊢ (𝐴 ∈ dom arctan → (∗‘𝐴) ∈ dom arctan)
121	18, 120	syl 17	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘𝐴) ∈ dom arctan)
122		atandm2 24604	. . . . . . . . . 10 ⊢ ((∗‘𝐴) ∈ dom arctan ↔ ((∗‘𝐴) ∈ ℂ ∧ (1 − (i · (∗‘𝐴))) ≠ 0 ∧ (1 + (i · (∗‘𝐴))) ≠ 0))
123	122	simp3bi 1078	. . . . . . . . 9 ⊢ ((∗‘𝐴) ∈ dom arctan → (1 + (i · (∗‘𝐴))) ≠ 0)
124	121, 123	syl 17	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 + (i · (∗‘𝐴))) ≠ 0)
125	119, 124	logcld 24317	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 + (i · (∗‘𝐴)))) ∈ ℂ)
126		subcl 10280	. . . . . . . . 9 ⊢ ((1 ∈ ℂ ∧ (i · (∗‘𝐴)) ∈ ℂ) → (1 − (i · (∗‘𝐴))) ∈ ℂ)
127	21, 91, 126	sylancr 695	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · (∗‘𝐴))) ∈ ℂ)
128	122	simp2bi 1077	. . . . . . . . 9 ⊢ ((∗‘𝐴) ∈ dom arctan → (1 − (i · (∗‘𝐴))) ≠ 0)
129	121, 128	syl 17	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (1 − (i · (∗‘𝐴))) ≠ 0)
130	127, 129	logcld 24317	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (log‘(1 − (i · (∗‘𝐴)))) ∈ ℂ)
131	125, 130	negsubdi2d 10408	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -((log‘(1 + (i · (∗‘𝐴)))) − (log‘(1 − (i · (∗‘𝐴))))) = ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴))))))
132	117, 131	eqtrd 2656	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))) = ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴))))))
133	132	oveq2d 6666	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → ((i / 2) · -(∗‘((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
134	36, 54, 133	3eqtrd 2660	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
135		atanval 24611	. . . . 5 ⊢ (𝐴 ∈ dom arctan → (arctan‘𝐴) = ((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))))
136	18, 135	syl 17	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (arctan‘𝐴) = ((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴))))))
137	136	fveq2d 6195	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(arctan‘𝐴)) = (∗‘((i / 2) · ((log‘(1 − (i · 𝐴))) − (log‘(1 + (i · 𝐴)))))))
138		atanval 24611	. . . 4 ⊢ ((∗‘𝐴) ∈ dom arctan → (arctan‘(∗‘𝐴)) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
139	121, 138	syl 17	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (arctan‘(∗‘𝐴)) = ((i / 2) · ((log‘(1 − (i · (∗‘𝐴)))) − (log‘(1 + (i · (∗‘𝐴)))))))
140	134, 137, 139	3eqtr4d 2666	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (∗‘(arctan‘𝐴)) = (arctan‘(∗‘𝐴)))
141	18, 140	jca 554	1 ⊢ ((𝐴 ∈ ℂ ∧ (ℜ‘𝐴) ≠ 0) → (𝐴 ∈ dom arctan ∧ (∗‘(arctan‘𝐴)) = (arctan‘(∗‘𝐴))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 384 ∧ w3a 1037 = wceq 1483 ∈ wcel 1990 ≠ wne 2794 dom cdm 5114 ‘cfv 5888 (class class class)co 6650 ℂcc 9934 ℝcr 9935 0cc0 9936 1c1 9937 ici 9938 + caddc 9939 · cmul 9941 − cmin 10266 -cneg 10267 / cdiv 10684 2c2 11070 ∗ccj 13836 ℜcre 13837 ℑcim 13838 logclog 24301 arctancatan 24591

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-inf2 8538 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 ax-pre-sup 10014 ax-addf 10015 ax-mulf 10016

This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-fal 1489 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-iin 4523 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-se 5074 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-isom 5897 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-of 6897 df-om 7066 df-1st 7168 df-2nd 7169 df-supp 7296 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-2o 7561 df-oadd 7564 df-er 7742 df-map 7859 df-pm 7860 df-ixp 7909 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-fsupp 8276 df-fi 8317 df-sup 8348 df-inf 8349 df-oi 8415 df-card 8765 df-cda 8990 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-div 10685 df-nn 11021 df-2 11079 df-3 11080 df-4 11081 df-5 11082 df-6 11083 df-7 11084 df-8 11085 df-9 11086 df-n0 11293 df-z 11378 df-dec 11494 df-uz 11688 df-q 11789 df-rp 11833 df-xneg 11946 df-xadd 11947 df-xmul 11948 df-ioo 12179 df-ioc 12180 df-ico 12181 df-icc 12182 df-fz 12327 df-fzo 12466 df-fl 12593 df-mod 12669 df-seq 12802 df-exp 12861 df-fac 13061 df-bc 13090 df-hash 13118 df-shft 13807 df-cj 13839 df-re 13840 df-im 13841 df-sqrt 13975 df-abs 13976 df-limsup 14202 df-clim 14219 df-rlim 14220 df-sum 14417 df-ef 14798 df-sin 14800 df-cos 14801 df-pi 14803 df-struct 15859 df-ndx 15860 df-slot 15861 df-base 15863 df-sets 15864 df-ress 15865 df-plusg 15954 df-mulr 15955 df-starv 15956 df-sca 15957 df-vsca 15958 df-ip 15959 df-tset 15960 df-ple 15961 df-ds 15964 df-unif 15965 df-hom 15966 df-cco 15967 df-rest 16083 df-topn 16084 df-0g 16102 df-gsum 16103 df-topgen 16104 df-pt 16105 df-prds 16108 df-xrs 16162 df-qtop 16167 df-imas 16168 df-xps 16170 df-mre 16246 df-mrc 16247 df-acs 16249 df-mgm 17242 df-sgrp 17284 df-mnd 17295 df-submnd 17336 df-mulg 17541 df-cntz 17750 df-cmn 18195 df-psmet 19738 df-xmet 19739 df-met 19740 df-bl 19741 df-mopn 19742 df-fbas 19743 df-fg 19744 df-cnfld 19747 df-top 20699 df-topon 20716 df-topsp 20737 df-bases 20750 df-cld 20823 df-ntr 20824 df-cls 20825 df-nei 20902 df-lp 20940 df-perf 20941 df-cn 21031 df-cnp 21032 df-haus 21119 df-tx 21365 df-hmeo 21558 df-fil 21650 df-fm 21742 df-flim 21743 df-flf 21744 df-xms 22125 df-ms 22126 df-tms 22127 df-cncf 22681 df-limc 23630 df-dv 23631 df-log 24303 df-atan 24594

This theorem is referenced by: atanrecl 24638

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