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Theorem sineq0 26471

Description: A complex number whose sine is zero is an integer multiple of π. (Contributed by NM, 17-Aug-2008.) (Revised by Mario Carneiro, 10-May-2014.)

**Assertion**
Ref	Expression
sineq0	⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (𝐴 / π) ∈ ℤ))

**Proof of Theorem sineq0**
Step	Hyp	Ref	Expression
1		sinval 16099	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (sin‘𝐴) = (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)))
2	1	eqeq1d 2730	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0))
3		ax-icn 11198	. . . . . . . . . . . . . . . . . . . 20 ⊢ i ∈ ℂ
4		mulcl 11223	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · 𝐴) ∈ ℂ)
5	3, 4	mpan 689	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (i · 𝐴) ∈ ℂ)
6		efcl 16059	. . . . . . . . . . . . . . . . . . 19 ⊢ ((i · 𝐴) ∈ ℂ → (exp‘(i · 𝐴)) ∈ ℂ)
7	5, 6	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → (exp‘(i · 𝐴)) ∈ ℂ)
8		negicn 11492	. . . . . . . . . . . . . . . . . . . 20 ⊢ -i ∈ ℂ
9		mulcl 11223	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((-i ∈ ℂ ∧ 𝐴 ∈ ℂ) → (-i · 𝐴) ∈ ℂ)
10	8, 9	mpan 689	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (-i · 𝐴) ∈ ℂ)
11		efcl 16059	. . . . . . . . . . . . . . . . . . 19 ⊢ ((-i · 𝐴) ∈ ℂ → (exp‘(-i · 𝐴)) ∈ ℂ)
12	10, 11	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → (exp‘(-i · 𝐴)) ∈ ℂ)
13	7, 12	subcld 11602	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) ∈ ℂ)
14		2mulicn 12466	. . . . . . . . . . . . . . . . . 18 ⊢ (2 · i) ∈ ℂ
15		2muline0 12467	. . . . . . . . . . . . . . . . . 18 ⊢ (2 · i) ≠ 0
16		diveq0 11913	. . . . . . . . . . . . . . . . . 18 ⊢ ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) ∈ ℂ ∧ (2 · i) ∈ ℂ ∧ (2 · i) ≠ 0) → ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0 ↔ ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0))
17	14, 15, 16	mp3an23 1450	. . . . . . . . . . . . . . . . 17 ⊢ (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) ∈ ℂ → ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0 ↔ ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0))
18	13, 17	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → ((((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) / (2 · i)) = 0 ↔ ((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0))
19	7, 12	subeq0ad 11612	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (((exp‘(i · 𝐴)) − (exp‘(-i · 𝐴))) = 0 ↔ (exp‘(i · 𝐴)) = (exp‘(-i · 𝐴))))
20	2, 18, 19	3bitrd 305	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (exp‘(i · 𝐴)) = (exp‘(-i · 𝐴))))
21		oveq2 7428	. . . . . . . . . . . . . . . 16 ⊢ ((exp‘(i · 𝐴)) = (exp‘(-i · 𝐴)) → ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))))
22		2cn 12318	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ 2 ∈ ℂ
23		mul12 11410	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((i ∈ ℂ ∧ 2 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (i · (2 · 𝐴)) = (2 · (i · 𝐴)))
24	3, 22, 23	mp3an12 1448	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝐴 ∈ ℂ → (i · (2 · 𝐴)) = (2 · (i · 𝐴)))
25	5	2timesd 12486	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝐴 ∈ ℂ → (2 · (i · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
26	24, 25	eqtrd 2768	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐴 ∈ ℂ → (i · (2 · 𝐴)) = ((i · 𝐴) + (i · 𝐴)))
27	26	fveq2d 6901	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘(i · (2 · 𝐴))) = (exp‘((i · 𝐴) + (i · 𝐴))))
28		efadd 16071	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((i · 𝐴) ∈ ℂ ∧ (i · 𝐴) ∈ ℂ) → (exp‘((i · 𝐴) + (i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))))
29	5, 5, 28	syl2anc 583	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))))
30	27, 29	eqtr2d 2769	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = (exp‘(i · (2 · 𝐴))))
31		efadd 16071	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((i · 𝐴) ∈ ℂ ∧ (-i · 𝐴) ∈ ℂ) → (exp‘((i · 𝐴) + (-i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))))
32	5, 10, 31	syl2anc 583	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (-i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))))
33	3	negidi 11560	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (i + -i) = 0
34	33	oveq1i 7430	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((i + -i) · 𝐴) = (0 · 𝐴)
35		adddir 11236	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((i ∈ ℂ ∧ -i ∈ ℂ ∧ 𝐴 ∈ ℂ) → ((i + -i) · 𝐴) = ((i · 𝐴) + (-i · 𝐴)))
36	3, 8, 35	mp3an12 1448	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝐴 ∈ ℂ → ((i + -i) · 𝐴) = ((i · 𝐴) + (-i · 𝐴)))
37		mul02 11423	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝐴 ∈ ℂ → (0 · 𝐴) = 0)
38	34, 36, 37	3eqtr3a 2792	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝐴 ∈ ℂ → ((i · 𝐴) + (-i · 𝐴)) = 0)
39	38	fveq2d 6901	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (-i · 𝐴))) = (exp‘0))
40		ef0 16068	. . . . . . . . . . . . . . . . . . . 20 ⊢ (exp‘0) = 1
41	39, 40	eqtrdi 2784	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐴 ∈ ℂ → (exp‘((i · 𝐴) + (-i · 𝐴))) = 1)
42	32, 41	eqtr3d 2770	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))) = 1)
43	30, 42	eqeq12d 2744	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))) ↔ (exp‘(i · (2 · 𝐴))) = 1))
44		fveq2 6897	. . . . . . . . . . . . . . . . 17 ⊢ ((exp‘(i · (2 · 𝐴))) = 1 → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1))
45	43, 44	biimtrdi 252	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (((exp‘(i · 𝐴)) · (exp‘(i · 𝐴))) = ((exp‘(i · 𝐴)) · (exp‘(-i · 𝐴))) → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1)))
46	21, 45	syl5 34	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → ((exp‘(i · 𝐴)) = (exp‘(-i · 𝐴)) → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1)))
47	20, 46	sylbid 239	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 → (abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1)))
48		abs1 15277	. . . . . . . . . . . . . . . 16 ⊢ (abs‘1) = 1
49	48	eqeq2i 2741	. . . . . . . . . . . . . . 15 ⊢ ((abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1) ↔ (abs‘(exp‘(i · (2 · 𝐴)))) = 1)
50		2re 12317	. . . . . . . . . . . . . . . . 17 ⊢ 2 ∈ ℝ
51		2ne0 12347	. . . . . . . . . . . . . . . . 17 ⊢ 2 ≠ 0
52		mulre 15101	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℂ ∧ 2 ∈ ℝ ∧ 2 ≠ 0) → (𝐴 ∈ ℝ ↔ (2 · 𝐴) ∈ ℝ))
53	50, 51, 52	mp3an23 1450	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → (𝐴 ∈ ℝ ↔ (2 · 𝐴) ∈ ℝ))
54		mulcl 11223	. . . . . . . . . . . . . . . . . 18 ⊢ ((2 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (2 · 𝐴) ∈ ℂ)
55	22, 54	mpan 689	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ ℂ → (2 · 𝐴) ∈ ℂ)
56		absefib 16175	. . . . . . . . . . . . . . . . 17 ⊢ ((2 · 𝐴) ∈ ℂ → ((2 · 𝐴) ∈ ℝ ↔ (abs‘(exp‘(i · (2 · 𝐴)))) = 1))
57	55, 56	syl 17	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℂ → ((2 · 𝐴) ∈ ℝ ↔ (abs‘(exp‘(i · (2 · 𝐴)))) = 1))
58	53, 57	bitr2d 280	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℂ → ((abs‘(exp‘(i · (2 · 𝐴)))) = 1 ↔ 𝐴 ∈ ℝ))
59	49, 58	bitrid 283	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ ℂ → ((abs‘(exp‘(i · (2 · 𝐴)))) = (abs‘1) ↔ 𝐴 ∈ ℝ))
60	47, 59	sylibd 238	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 → 𝐴 ∈ ℝ))
61	60	imp 406	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → 𝐴 ∈ ℝ)
62		pirp 26409	. . . . . . . . . . . 12 ⊢ π ∈ ℝ⁺
63		modval 13869	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → (𝐴 mod π) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
64	61, 62, 63	sylancl 585	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
65		picn 26407	. . . . . . . . . . . . 13 ⊢ π ∈ ℂ
66		pire 26406	. . . . . . . . . . . . . . . . 17 ⊢ π ∈ ℝ
67		pipos 26408	. . . . . . . . . . . . . . . . . 18 ⊢ 0 < π
68	66, 67	gt0ne0ii 11781	. . . . . . . . . . . . . . . . 17 ⊢ π ≠ 0
69		redivcl 11964	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ ∧ π ≠ 0) → (𝐴 / π) ∈ ℝ)
70	66, 68, 69	mp3an23 1450	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ ℝ → (𝐴 / π) ∈ ℝ)
71	61, 70	syl 17	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 / π) ∈ ℝ)
72	71	flcld 13796	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (⌊‘(𝐴 / π)) ∈ ℤ)
73	72	zcnd 12698	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (⌊‘(𝐴 / π)) ∈ ℂ)
74		mulcl 11223	. . . . . . . . . . . . 13 ⊢ ((π ∈ ℂ ∧ (⌊‘(𝐴 / π)) ∈ ℂ) → (π · (⌊‘(𝐴 / π))) ∈ ℂ)
75	65, 73, 74	sylancr 586	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (π · (⌊‘(𝐴 / π))) ∈ ℂ)
76		negsub 11539	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (π · (⌊‘(𝐴 / π))) ∈ ℂ) → (𝐴 + -(π · (⌊‘(𝐴 / π)))) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
77	75, 76	syldan 590	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 + -(π · (⌊‘(𝐴 / π)))) = (𝐴 − (π · (⌊‘(𝐴 / π)))))
78		mulcom 11225	. . . . . . . . . . . . . . 15 ⊢ ((π ∈ ℂ ∧ (⌊‘(𝐴 / π)) ∈ ℂ) → (π · (⌊‘(𝐴 / π))) = ((⌊‘(𝐴 / π)) · π))
79	65, 73, 78	sylancr 586	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (π · (⌊‘(𝐴 / π))) = ((⌊‘(𝐴 / π)) · π))
80	79	negeqd 11485	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → -(π · (⌊‘(𝐴 / π))) = -((⌊‘(𝐴 / π)) · π))
81		mulneg1 11681	. . . . . . . . . . . . . 14 ⊢ (((⌊‘(𝐴 / π)) ∈ ℂ ∧ π ∈ ℂ) → (-(⌊‘(𝐴 / π)) · π) = -((⌊‘(𝐴 / π)) · π))
82	73, 65, 81	sylancl 585	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (-(⌊‘(𝐴 / π)) · π) = -((⌊‘(𝐴 / π)) · π))
83	80, 82	eqtr4d 2771	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → -(π · (⌊‘(𝐴 / π))) = (-(⌊‘(𝐴 / π)) · π))
84	83	oveq2d 7436	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 + -(π · (⌊‘(𝐴 / π)))) = (𝐴 + (-(⌊‘(𝐴 / π)) · π)))
85	64, 77, 84	3eqtr2d 2774	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) = (𝐴 + (-(⌊‘(𝐴 / π)) · π)))
86	85	fveq2d 6901	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (sin‘(𝐴 mod π)) = (sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π))))
87	86	fveq2d 6901	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 mod π))) = (abs‘(sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π)))))
88	72	znegcld 12699	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → -(⌊‘(𝐴 / π)) ∈ ℤ)
89		abssinper 26468	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ -(⌊‘(𝐴 / π)) ∈ ℤ) → (abs‘(sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π)))) = (abs‘(sin‘𝐴)))
90	88, 89	syldan 590	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 + (-(⌊‘(𝐴 / π)) · π)))) = (abs‘(sin‘𝐴)))
91		simpr 484	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (sin‘𝐴) = 0)
92	91	fveq2d 6901	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘𝐴)) = (abs‘0))
93	87, 90, 92	3eqtrd 2772	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 mod π))) = (abs‘0))
94		abs0 15265	. . . . . . 7 ⊢ (abs‘0) = 0
95	93, 94	eqtrdi 2784	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (abs‘(sin‘(𝐴 mod π))) = 0)
96		modcl 13871	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → (𝐴 mod π) ∈ ℝ)
97	61, 62, 96	sylancl 585	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) ∈ ℝ)
98		modlt 13878	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → (𝐴 mod π) < π)
99	61, 62, 98	sylancl 585	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) < π)
100	97, 99	jca 511	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π))
101	100	biantrurd 532	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) ↔ (((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π) ∧ 0 < (𝐴 mod π))))
102		0re 11247	. . . . . . . . . . . 12 ⊢ 0 ∈ ℝ
103		rexr 11291	. . . . . . . . . . . . 13 ⊢ (0 ∈ ℝ → 0 ∈ ℝ^*)
104		rexr 11291	. . . . . . . . . . . . 13 ⊢ (π ∈ ℝ → π ∈ ℝ^*)
105		elioo2 13398	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ^* ∧ π ∈ ℝ^*) → ((𝐴 mod π) ∈ (0(,)π) ↔ ((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π)))
106	103, 104, 105	syl2an 595	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℝ ∧ π ∈ ℝ) → ((𝐴 mod π) ∈ (0(,)π) ↔ ((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π)))
107	102, 66, 106	mp2an 691	. . . . . . . . . . 11 ⊢ ((𝐴 mod π) ∈ (0(,)π) ↔ ((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π))
108		3anan32 1095	. . . . . . . . . . 11 ⊢ (((𝐴 mod π) ∈ ℝ ∧ 0 < (𝐴 mod π) ∧ (𝐴 mod π) < π) ↔ (((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π) ∧ 0 < (𝐴 mod π)))
109	107, 108	bitri 275	. . . . . . . . . 10 ⊢ ((𝐴 mod π) ∈ (0(,)π) ↔ (((𝐴 mod π) ∈ ℝ ∧ (𝐴 mod π) < π) ∧ 0 < (𝐴 mod π)))
110	101, 109	bitr4di 289	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) ↔ (𝐴 mod π) ∈ (0(,)π)))
111		sinq12gt0 26455	. . . . . . . . . 10 ⊢ ((𝐴 mod π) ∈ (0(,)π) → 0 < (sin‘(𝐴 mod π)))
112		elioore 13387	. . . . . . . . . . . 12 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (𝐴 mod π) ∈ ℝ)
113	112	resincld 16120	. . . . . . . . . . 11 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (sin‘(𝐴 mod π)) ∈ ℝ)
114		ltle 11333	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ ∧ (sin‘(𝐴 mod π)) ∈ ℝ) → (0 < (sin‘(𝐴 mod π)) → 0 ≤ (sin‘(𝐴 mod π))))
115	102, 113, 114	sylancr 586	. . . . . . . . . . . 12 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (0 < (sin‘(𝐴 mod π)) → 0 ≤ (sin‘(𝐴 mod π))))
116	111, 115	mpd 15	. . . . . . . . . . 11 ⊢ ((𝐴 mod π) ∈ (0(,)π) → 0 ≤ (sin‘(𝐴 mod π)))
117	113, 116	absidd 15402	. . . . . . . . . 10 ⊢ ((𝐴 mod π) ∈ (0(,)π) → (abs‘(sin‘(𝐴 mod π))) = (sin‘(𝐴 mod π)))
118	111, 117	breqtrrd 5176	. . . . . . . . 9 ⊢ ((𝐴 mod π) ∈ (0(,)π) → 0 < (abs‘(sin‘(𝐴 mod π))))
119	110, 118	biimtrdi 252	. . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) → 0 < (abs‘(sin‘(𝐴 mod π)))))
120		ltne 11342	. . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ 0 < (abs‘(sin‘(𝐴 mod π)))) → (abs‘(sin‘(𝐴 mod π))) ≠ 0)
121	102, 120	mpan 689	. . . . . . . 8 ⊢ (0 < (abs‘(sin‘(𝐴 mod π))) → (abs‘(sin‘(𝐴 mod π))) ≠ 0)
122	119, 121	syl6 35	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) → (abs‘(sin‘(𝐴 mod π))) ≠ 0))
123	122	necon2bd 2953	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ((abs‘(sin‘(𝐴 mod π))) = 0 → ¬ 0 < (𝐴 mod π)))
124	95, 123	mpd 15	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ¬ 0 < (𝐴 mod π))
125		modge0 13877	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → 0 ≤ (𝐴 mod π))
126	61, 62, 125	sylancl 585	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → 0 ≤ (𝐴 mod π))
127		leloe 11331	. . . . . . . 8 ⊢ ((0 ∈ ℝ ∧ (𝐴 mod π) ∈ ℝ) → (0 ≤ (𝐴 mod π) ↔ (0 < (𝐴 mod π) ∨ 0 = (𝐴 mod π))))
128	102, 97, 127	sylancr 586	. . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 ≤ (𝐴 mod π) ↔ (0 < (𝐴 mod π) ∨ 0 = (𝐴 mod π))))
129	126, 128	mpbid 231	. . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (0 < (𝐴 mod π) ∨ 0 = (𝐴 mod π)))
130	129	ord 863	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (¬ 0 < (𝐴 mod π) → 0 = (𝐴 mod π)))
131	124, 130	mpd 15	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → 0 = (𝐴 mod π))
132	131	eqcomd 2734	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 mod π) = 0)
133		mod0 13874	. . . 4 ⊢ ((𝐴 ∈ ℝ ∧ π ∈ ℝ⁺) → ((𝐴 mod π) = 0 ↔ (𝐴 / π) ∈ ℤ))
134	61, 62, 133	sylancl 585	. . 3 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → ((𝐴 mod π) = 0 ↔ (𝐴 / π) ∈ ℤ))
135	132, 134	mpbid 231	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (sin‘𝐴) = 0) → (𝐴 / π) ∈ ℤ)
136		divcan1 11912	. . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ π ∈ ℂ ∧ π ≠ 0) → ((𝐴 / π) · π) = 𝐴)
137	65, 68, 136	mp3an23 1450	. . . 4 ⊢ (𝐴 ∈ ℂ → ((𝐴 / π) · π) = 𝐴)
138	137	fveq2d 6901	. . 3 ⊢ (𝐴 ∈ ℂ → (sin‘((𝐴 / π) · π)) = (sin‘𝐴))
139		sinkpi 26469	. . 3 ⊢ ((𝐴 / π) ∈ ℤ → (sin‘((𝐴 / π) · π)) = 0)
140	138, 139	sylan9req 2789	. 2 ⊢ ((𝐴 ∈ ℂ ∧ (𝐴 / π) ∈ ℤ) → (sin‘𝐴) = 0)
141	135, 140	impbida 800	1 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) = 0 ↔ (𝐴 / π) ∈ ℤ))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 846 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2937 class class class wbr 5148 ‘cfv 6548 (class class class)co 7420 ℂcc 11137 ℝcr 11138 0cc0 11139 1c1 11140 ici 11141 + caddc 11142 · cmul 11144 ℝ^*cxr 11278 < clt 11279 ≤ cle 11280 − cmin 11475 -cneg 11476 / cdiv 11902 2c2 12298 ℤcz 12589 ℝ⁺crp 13007 (,)cioo 13357 ⌊cfl 13788 mod cmo 13867 abscabs 15214 expce 16038 sincsin 16040 πcpi 16043

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-inf2 9665 ax-cnex 11195 ax-resscn 11196 ax-1cn 11197 ax-icn 11198 ax-addcl 11199 ax-addrcl 11200 ax-mulcl 11201 ax-mulrcl 11202 ax-mulcom 11203 ax-addass 11204 ax-mulass 11205 ax-distr 11206 ax-i2m1 11207 ax-1ne0 11208 ax-1rid 11209 ax-rnegex 11210 ax-rrecex 11211 ax-cnre 11212 ax-pre-lttri 11213 ax-pre-lttrn 11214 ax-pre-ltadd 11215 ax-pre-mulgt0 11216 ax-pre-sup 11217 ax-addf 11218

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-tp 4634 df-op 4636 df-uni 4909 df-int 4950 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-se 5634 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-isom 6557 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-of 7685 df-om 7871 df-1st 7993 df-2nd 7994 df-supp 8166 df-frecs 8287 df-wrecs 8318 df-recs 8392 df-rdg 8431 df-1o 8487 df-2o 8488 df-er 8725 df-map 8847 df-pm 8848 df-ixp 8917 df-en 8965 df-dom 8966 df-sdom 8967 df-fin 8968 df-fsupp 9387 df-fi 9435 df-sup 9466 df-inf 9467 df-oi 9534 df-card 9963 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284 df-le 11285 df-sub 11477 df-neg 11478 df-div 11903 df-nn 12244 df-2 12306 df-3 12307 df-4 12308 df-5 12309 df-6 12310 df-7 12311 df-8 12312 df-9 12313 df-n0 12504 df-z 12590 df-dec 12709 df-uz 12854 df-q 12964 df-rp 13008 df-xneg 13125 df-xadd 13126 df-xmul 13127 df-ioo 13361 df-ioc 13362 df-ico 13363 df-icc 13364 df-fz 13518 df-fzo 13661 df-fl 13790 df-mod 13868 df-seq 14000 df-exp 14060 df-fac 14266 df-bc 14295 df-hash 14323 df-shft 15047 df-cj 15079 df-re 15080 df-im 15081 df-sqrt 15215 df-abs 15216 df-limsup 15448 df-clim 15465 df-rlim 15466 df-sum 15666 df-ef 16044 df-sin 16046 df-cos 16047 df-pi 16049 df-struct 17116 df-sets 17133 df-slot 17151 df-ndx 17163 df-base 17181 df-ress 17210 df-plusg 17246 df-mulr 17247 df-starv 17248 df-sca 17249 df-vsca 17250 df-ip 17251 df-tset 17252 df-ple 17253 df-ds 17255 df-unif 17256 df-hom 17257 df-cco 17258 df-rest 17404 df-topn 17405 df-0g 17423 df-gsum 17424 df-topgen 17425 df-pt 17426 df-prds 17429 df-xrs 17484 df-qtop 17489 df-imas 17490 df-xps 17492 df-mre 17566 df-mrc 17567 df-acs 17569 df-mgm 18600 df-sgrp 18679 df-mnd 18695 df-submnd 18741 df-mulg 19024 df-cntz 19268 df-cmn 19737 df-psmet 21271 df-xmet 21272 df-met 21273 df-bl 21274 df-mopn 21275 df-fbas 21276 df-fg 21277 df-cnfld 21280 df-top 22809 df-topon 22826 df-topsp 22848 df-bases 22862 df-cld 22936 df-ntr 22937 df-cls 22938 df-nei 23015 df-lp 23053 df-perf 23054 df-cn 23144 df-cnp 23145 df-haus 23232 df-tx 23479 df-hmeo 23672 df-fil 23763 df-fm 23855 df-flim 23856 df-flf 23857 df-xms 24239 df-ms 24240 df-tms 24241 df-cncf 24811 df-limc 25808 df-dv 25809

This theorem is referenced by: coseq1 26472 efeq1 26475 cosne0 26476 logf1o2 26597 coseq0 45252 sinaover2ne0 45256 dirker2re 45480 dirkerdenne0 45481 dirkertrigeqlem3 45488 dirkertrigeq 45489 dirkercncflem1 45491 dirkercncflem2 45492 dirkercncflem4 45494 fourierdlem103 45597 fourierdlem104 45598

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