sqwvfourb - Mathbox for Glauco Siliprandi

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Theorem sqwvfourb 42563

Description: Fourier series 𝐵 coefficients for the square wave function. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
sqwvfourb.t	⊢ 𝑇 = (2 · π)
sqwvfourb.f	⊢ 𝐹 = (𝑥 ∈ ℝ ↦ if((𝑥 mod 𝑇) < π, 1, -1))
sqwvfourb.n	⊢ (𝜑 → 𝑁 ∈ ℕ)

**Assertion**
Ref	Expression
sqwvfourb	⊢ (𝜑 → (∫(-π(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 / π) = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))

Distinct variable groups: 𝑥,𝑁 𝜑,𝑥 Allowed substitution hints: 𝑇(𝑥) 𝐹(𝑥)

**Proof of Theorem sqwvfourb**
Step	Hyp	Ref	Expression
1		pire 25044	. . . . . 6 ⊢ π ∈ ℝ
2	1	renegcli 10947	. . . . 5 ⊢ -π ∈ ℝ
3	2	a1i 11	. . . 4 ⊢ (𝜑 → -π ∈ ℝ)
4	1	a1i 11	. . . 4 ⊢ (𝜑 → π ∈ ℝ)
5		0re 10643	. . . . . 6 ⊢ 0 ∈ ℝ
6		negpilt0 41595	. . . . . . 7 ⊢ -π < 0
7	2, 5, 6	ltleii 10763	. . . . . 6 ⊢ -π ≤ 0
8		pipos 25046	. . . . . . 7 ⊢ 0 < π
9	5, 1, 8	ltleii 10763	. . . . . 6 ⊢ 0 ≤ π
10	2, 1	elicc2i 12803	. . . . . 6 ⊢ (0 ∈ (-π[,]π) ↔ (0 ∈ ℝ ∧ -π ≤ 0 ∧ 0 ≤ π))
11	5, 7, 9, 10	mpbir3an 1337	. . . . 5 ⊢ 0 ∈ (-π[,]π)
12	11	a1i 11	. . . 4 ⊢ (𝜑 → 0 ∈ (-π[,]π))
13		elioore 12769	. . . . . . . 8 ⊢ (𝑥 ∈ (-π(,)π) → 𝑥 ∈ ℝ)
14	13	adantl 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → 𝑥 ∈ ℝ)
15		1re 10641	. . . . . . . 8 ⊢ 1 ∈ ℝ
16	15	renegcli 10947	. . . . . . . 8 ⊢ -1 ∈ ℝ
17	15, 16	ifcli 4513	. . . . . . 7 ⊢ if((𝑥 mod 𝑇) < π, 1, -1) ∈ ℝ
18		sqwvfourb.f	. . . . . . . 8 ⊢ 𝐹 = (𝑥 ∈ ℝ ↦ if((𝑥 mod 𝑇) < π, 1, -1))
19	18	fvmpt2 6779	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ if((𝑥 mod 𝑇) < π, 1, -1) ∈ ℝ) → (𝐹‘𝑥) = if((𝑥 mod 𝑇) < π, 1, -1))
20	14, 17, 19	sylancl 588	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → (𝐹‘𝑥) = if((𝑥 mod 𝑇) < π, 1, -1))
21	17	a1i 11	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → if((𝑥 mod 𝑇) < π, 1, -1) ∈ ℝ)
22	21	recnd 10669	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → if((𝑥 mod 𝑇) < π, 1, -1) ∈ ℂ)
23	20, 22	eqeltrd 2913	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → (𝐹‘𝑥) ∈ ℂ)
24		sqwvfourb.n	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 ∈ ℕ)
25	24	nncnd 11654	. . . . . . . 8 ⊢ (𝜑 → 𝑁 ∈ ℂ)
26	25	adantr 483	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → 𝑁 ∈ ℂ)
27	14	recnd 10669	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → 𝑥 ∈ ℂ)
28	26, 27	mulcld 10661	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → (𝑁 · 𝑥) ∈ ℂ)
29	28	sincld 15483	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → (sin‘(𝑁 · 𝑥)) ∈ ℂ)
30	23, 29	mulcld 10661	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)π)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) ∈ ℂ)
31		elioore 12769	. . . . . . . . . 10 ⊢ (𝑥 ∈ (-π(,)0) → 𝑥 ∈ ℝ)
32	31, 17, 19	sylancl 588	. . . . . . . . 9 ⊢ (𝑥 ∈ (-π(,)0) → (𝐹‘𝑥) = if((𝑥 mod 𝑇) < π, 1, -1))
33	1	a1i 11	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (-π(,)0) → π ∈ ℝ)
34		sqwvfourb.t	. . . . . . . . . . . . . 14 ⊢ 𝑇 = (2 · π)
35		2rp 12395	. . . . . . . . . . . . . . 15 ⊢ 2 ∈ ℝ⁺
36		pirp 25047	. . . . . . . . . . . . . . 15 ⊢ π ∈ ℝ⁺
37		rpmulcl 12413	. . . . . . . . . . . . . . 15 ⊢ ((2 ∈ ℝ⁺ ∧ π ∈ ℝ⁺) → (2 · π) ∈ ℝ⁺)
38	35, 36, 37	mp2an 690	. . . . . . . . . . . . . 14 ⊢ (2 · π) ∈ ℝ⁺
39	34, 38	eqeltri 2909	. . . . . . . . . . . . 13 ⊢ 𝑇 ∈ ℝ⁺
40	39	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (-π(,)0) → 𝑇 ∈ ℝ⁺)
41	31, 40	modcld 13244	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (-π(,)0) → (𝑥 mod 𝑇) ∈ ℝ)
42		picn 25045	. . . . . . . . . . . . . . . . . 18 ⊢ π ∈ ℂ
43	42	2timesi 11776	. . . . . . . . . . . . . . . . 17 ⊢ (2 · π) = (π + π)
44	34, 43	eqtri 2844	. . . . . . . . . . . . . . . 16 ⊢ 𝑇 = (π + π)
45	44	oveq2i 7167	. . . . . . . . . . . . . . 15 ⊢ (-π + 𝑇) = (-π + (π + π))
46	2	recni 10655	. . . . . . . . . . . . . . . 16 ⊢ -π ∈ ℂ
47	46, 42, 42	addassi 10651	. . . . . . . . . . . . . . 15 ⊢ ((-π + π) + π) = (-π + (π + π))
48	42	negidi 10955	. . . . . . . . . . . . . . . . . 18 ⊢ (π + -π) = 0
49	42, 46, 48	addcomli 10832	. . . . . . . . . . . . . . . . 17 ⊢ (-π + π) = 0
50	49	oveq1i 7166	. . . . . . . . . . . . . . . 16 ⊢ ((-π + π) + π) = (0 + π)
51	42	addid2i 10828	. . . . . . . . . . . . . . . 16 ⊢ (0 + π) = π
52	50, 51	eqtri 2844	. . . . . . . . . . . . . . 15 ⊢ ((-π + π) + π) = π
53	45, 47, 52	3eqtr2ri 2851	. . . . . . . . . . . . . 14 ⊢ π = (-π + 𝑇)
54	53	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (-π(,)0) → π = (-π + 𝑇))
55	2	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (-π(,)0) → -π ∈ ℝ)
56		2re 11712	. . . . . . . . . . . . . . . . 17 ⊢ 2 ∈ ℝ
57	56, 1	remulcli 10657	. . . . . . . . . . . . . . . 16 ⊢ (2 · π) ∈ ℝ
58	34, 57	eqeltri 2909	. . . . . . . . . . . . . . 15 ⊢ 𝑇 ∈ ℝ
59	58	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (-π(,)0) → 𝑇 ∈ ℝ)
60	2	rexri 10699	. . . . . . . . . . . . . . 15 ⊢ -π ∈ ℝ^*
61		0xr 10688	. . . . . . . . . . . . . . 15 ⊢ 0 ∈ ℝ^*
62		ioogtlb 41819	. . . . . . . . . . . . . . 15 ⊢ ((-π ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝑥 ∈ (-π(,)0)) → -π < 𝑥)
63	60, 61, 62	mp3an12 1447	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (-π(,)0) → -π < 𝑥)
64	55, 31, 59, 63	ltadd1dd 11251	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (-π(,)0) → (-π + 𝑇) < (𝑥 + 𝑇))
65	54, 64	eqbrtrd 5088	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (-π(,)0) → π < (𝑥 + 𝑇))
66	58	recni 10655	. . . . . . . . . . . . . . . . 17 ⊢ 𝑇 ∈ ℂ
67	66	mulid2i 10646	. . . . . . . . . . . . . . . 16 ⊢ (1 · 𝑇) = 𝑇
68	67	eqcomi 2830	. . . . . . . . . . . . . . 15 ⊢ 𝑇 = (1 · 𝑇)
69	68	oveq2i 7167	. . . . . . . . . . . . . 14 ⊢ (𝑥 + 𝑇) = (𝑥 + (1 · 𝑇))
70	69	oveq1i 7166	. . . . . . . . . . . . 13 ⊢ ((𝑥 + 𝑇) mod 𝑇) = ((𝑥 + (1 · 𝑇)) mod 𝑇)
71	31, 59	readdcld 10670	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (-π(,)0) → (𝑥 + 𝑇) ∈ ℝ)
72		0red 10644	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ (-π(,)0) → 0 ∈ ℝ)
73	8	a1i 11	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ (-π(,)0) → 0 < π)
74	72, 33, 71, 73, 65	lttrd 10801	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ (-π(,)0) → 0 < (𝑥 + 𝑇))
75	72, 71, 74	ltled 10788	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (-π(,)0) → 0 ≤ (𝑥 + 𝑇))
76		iooltub 41835	. . . . . . . . . . . . . . . . 17 ⊢ ((-π ∈ ℝ^* ∧ 0 ∈ ℝ^* ∧ 𝑥 ∈ (-π(,)0)) → 𝑥 < 0)
77	60, 61, 76	mp3an12 1447	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ (-π(,)0) → 𝑥 < 0)
78	31, 72, 59, 77	ltadd1dd 11251	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ (-π(,)0) → (𝑥 + 𝑇) < (0 + 𝑇))
79	59	recnd 10669	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ (-π(,)0) → 𝑇 ∈ ℂ)
80	79	addid2d 10841	. . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ (-π(,)0) → (0 + 𝑇) = 𝑇)
81	78, 80	breqtrd 5092	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (-π(,)0) → (𝑥 + 𝑇) < 𝑇)
82		modid 13265	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 + 𝑇) ∈ ℝ ∧ 𝑇 ∈ ℝ⁺) ∧ (0 ≤ (𝑥 + 𝑇) ∧ (𝑥 + 𝑇) < 𝑇)) → ((𝑥 + 𝑇) mod 𝑇) = (𝑥 + 𝑇))
83	71, 40, 75, 81, 82	syl22anc 836	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (-π(,)0) → ((𝑥 + 𝑇) mod 𝑇) = (𝑥 + 𝑇))
84		1zzd 12014	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (-π(,)0) → 1 ∈ ℤ)
85		modcyc 13275	. . . . . . . . . . . . . 14 ⊢ ((𝑥 ∈ ℝ ∧ 𝑇 ∈ ℝ⁺ ∧ 1 ∈ ℤ) → ((𝑥 + (1 · 𝑇)) mod 𝑇) = (𝑥 mod 𝑇))
86	31, 40, 84, 85	syl3anc 1367	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (-π(,)0) → ((𝑥 + (1 · 𝑇)) mod 𝑇) = (𝑥 mod 𝑇))
87	70, 83, 86	3eqtr3a 2880	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (-π(,)0) → (𝑥 + 𝑇) = (𝑥 mod 𝑇))
88	65, 87	breqtrd 5092	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (-π(,)0) → π < (𝑥 mod 𝑇))
89	33, 41, 88	ltnsymd 10789	. . . . . . . . . 10 ⊢ (𝑥 ∈ (-π(,)0) → ¬ (𝑥 mod 𝑇) < π)
90	89	iffalsed 4478	. . . . . . . . 9 ⊢ (𝑥 ∈ (-π(,)0) → if((𝑥 mod 𝑇) < π, 1, -1) = -1)
91	32, 90	eqtrd 2856	. . . . . . . 8 ⊢ (𝑥 ∈ (-π(,)0) → (𝐹‘𝑥) = -1)
92	91	adantl 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → (𝐹‘𝑥) = -1)
93	92	oveq1d 7171	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (-1 · (sin‘(𝑁 · 𝑥))))
94	93	mpteq2dva 5161	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (-π(,)0) ↦ ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥)))) = (𝑥 ∈ (-π(,)0) ↦ (-1 · (sin‘(𝑁 · 𝑥)))))
95		neg1cn 11752	. . . . . . 7 ⊢ -1 ∈ ℂ
96	95	a1i 11	. . . . . 6 ⊢ (𝜑 → -1 ∈ ℂ)
97	24	nnred 11653	. . . . . . . . 9 ⊢ (𝜑 → 𝑁 ∈ ℝ)
98	97	adantr 483	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → 𝑁 ∈ ℝ)
99	31	adantl 484	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → 𝑥 ∈ ℝ)
100	98, 99	remulcld 10671	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → (𝑁 · 𝑥) ∈ ℝ)
101	100	resincld 15496	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → (sin‘(𝑁 · 𝑥)) ∈ ℝ)
102		ioossicc 12823	. . . . . . . 8 ⊢ (-π(,)0) ⊆ (-π[,]0)
103	102	a1i 11	. . . . . . 7 ⊢ (𝜑 → (-π(,)0) ⊆ (-π[,]0))
104		ioombl 24166	. . . . . . . 8 ⊢ (-π(,)0) ∈ dom vol
105	104	a1i 11	. . . . . . 7 ⊢ (𝜑 → (-π(,)0) ∈ dom vol)
106	97	adantr 483	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π[,]0)) → 𝑁 ∈ ℝ)
107		iccssre 12819	. . . . . . . . . . . 12 ⊢ ((-π ∈ ℝ ∧ 0 ∈ ℝ) → (-π[,]0) ⊆ ℝ)
108	2, 5, 107	mp2an 690	. . . . . . . . . . 11 ⊢ (-π[,]0) ⊆ ℝ
109	108	sseli 3963	. . . . . . . . . 10 ⊢ (𝑥 ∈ (-π[,]0) → 𝑥 ∈ ℝ)
110	109	adantl 484	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π[,]0)) → 𝑥 ∈ ℝ)
111	106, 110	remulcld 10671	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π[,]0)) → (𝑁 · 𝑥) ∈ ℝ)
112	111	resincld 15496	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π[,]0)) → (sin‘(𝑁 · 𝑥)) ∈ ℝ)
113		0red 10644	. . . . . . . 8 ⊢ (𝜑 → 0 ∈ ℝ)
114		sincn 25032	. . . . . . . . . 10 ⊢ sin ∈ (ℂ–cn→ℂ)
115	114	a1i 11	. . . . . . . . 9 ⊢ (𝜑 → sin ∈ (ℂ–cn→ℂ))
116		ax-resscn 10594	. . . . . . . . . . . . 13 ⊢ ℝ ⊆ ℂ
117	108, 116	sstri 3976	. . . . . . . . . . . 12 ⊢ (-π[,]0) ⊆ ℂ
118	117	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → (-π[,]0) ⊆ ℂ)
119		ssid 3989	. . . . . . . . . . . 12 ⊢ ℂ ⊆ ℂ
120	119	a1i 11	. . . . . . . . . . 11 ⊢ (𝜑 → ℂ ⊆ ℂ)
121	118, 25, 120	constcncfg 42203	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ (-π[,]0) ↦ 𝑁) ∈ ((-π[,]0)–cn→ℂ))
122	118, 120	idcncfg 42204	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ (-π[,]0) ↦ 𝑥) ∈ ((-π[,]0)–cn→ℂ))
123	121, 122	mulcncf 24047	. . . . . . . . 9 ⊢ (𝜑 → (𝑥 ∈ (-π[,]0) ↦ (𝑁 · 𝑥)) ∈ ((-π[,]0)–cn→ℂ))
124	115, 123	cncfmpt1f 23521	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ (-π[,]0) ↦ (sin‘(𝑁 · 𝑥))) ∈ ((-π[,]0)–cn→ℂ))
125		cniccibl 24441	. . . . . . . 8 ⊢ ((-π ∈ ℝ ∧ 0 ∈ ℝ ∧ (𝑥 ∈ (-π[,]0) ↦ (sin‘(𝑁 · 𝑥))) ∈ ((-π[,]0)–cn→ℂ)) → (𝑥 ∈ (-π[,]0) ↦ (sin‘(𝑁 · 𝑥))) ∈ 𝐿¹)
126	3, 113, 124, 125	syl3anc 1367	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ (-π[,]0) ↦ (sin‘(𝑁 · 𝑥))) ∈ 𝐿¹)
127	103, 105, 112, 126	iblss 24405	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (-π(,)0) ↦ (sin‘(𝑁 · 𝑥))) ∈ 𝐿¹)
128	96, 101, 127	iblmulc2 24431	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (-π(,)0) ↦ (-1 · (sin‘(𝑁 · 𝑥)))) ∈ 𝐿¹)
129	94, 128	eqeltrd 2913	. . . 4 ⊢ (𝜑 → (𝑥 ∈ (-π(,)0) ↦ ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥)))) ∈ 𝐿¹)
130	60	a1i 11	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (0(,)π) → -π ∈ ℝ^*)
131	1	rexri 10699	. . . . . . . . . . . 12 ⊢ π ∈ ℝ^*
132	131	a1i 11	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (0(,)π) → π ∈ ℝ^*)
133		elioore 12769	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (0(,)π) → 𝑥 ∈ ℝ)
134	2	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (0(,)π) → -π ∈ ℝ)
135		0red 10644	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (0(,)π) → 0 ∈ ℝ)
136	6	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (0(,)π) → -π < 0)
137		ioogtlb 41819	. . . . . . . . . . . . 13 ⊢ ((0 ∈ ℝ^* ∧ π ∈ ℝ^* ∧ 𝑥 ∈ (0(,)π)) → 0 < 𝑥)
138	61, 131, 137	mp3an12 1447	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (0(,)π) → 0 < 𝑥)
139	134, 135, 133, 136, 138	lttrd 10801	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (0(,)π) → -π < 𝑥)
140		iooltub 41835	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℝ^* ∧ π ∈ ℝ^* ∧ 𝑥 ∈ (0(,)π)) → 𝑥 < π)
141	61, 131, 140	mp3an12 1447	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (0(,)π) → 𝑥 < π)
142	130, 132, 133, 139, 141	eliood 41822	. . . . . . . . . 10 ⊢ (𝑥 ∈ (0(,)π) → 𝑥 ∈ (-π(,)π))
143	142, 20	sylan2 594	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → (𝐹‘𝑥) = if((𝑥 mod 𝑇) < π, 1, -1))
144	39	a1i 11	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (0(,)π) → 𝑇 ∈ ℝ⁺)
145	135, 133, 138	ltled 10788	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (0(,)π) → 0 ≤ 𝑥)
146	1	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (0(,)π) → π ∈ ℝ)
147	58	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (0(,)π) → 𝑇 ∈ ℝ)
148		2timesgt 41603	. . . . . . . . . . . . . . . . 17 ⊢ (π ∈ ℝ⁺ → π < (2 · π))
149	36, 148	ax-mp 5	. . . . . . . . . . . . . . . 16 ⊢ π < (2 · π)
150	149, 34	breqtrri 5093	. . . . . . . . . . . . . . 15 ⊢ π < 𝑇
151	150	a1i 11	. . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ (0(,)π) → π < 𝑇)
152	133, 146, 147, 141, 151	lttrd 10801	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (0(,)π) → 𝑥 < 𝑇)
153		modid 13265	. . . . . . . . . . . . 13 ⊢ (((𝑥 ∈ ℝ ∧ 𝑇 ∈ ℝ⁺) ∧ (0 ≤ 𝑥 ∧ 𝑥 < 𝑇)) → (𝑥 mod 𝑇) = 𝑥)
154	133, 144, 145, 152, 153	syl22anc 836	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ (0(,)π) → (𝑥 mod 𝑇) = 𝑥)
155	154, 141	eqbrtrd 5088	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (0(,)π) → (𝑥 mod 𝑇) < π)
156	155	iftrued 4475	. . . . . . . . . 10 ⊢ (𝑥 ∈ (0(,)π) → if((𝑥 mod 𝑇) < π, 1, -1) = 1)
157	156	adantl 484	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → if((𝑥 mod 𝑇) < π, 1, -1) = 1)
158	143, 157	eqtrd 2856	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → (𝐹‘𝑥) = 1)
159	158	oveq1d 7171	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (1 · (sin‘(𝑁 · 𝑥))))
160	142, 29	sylan2 594	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → (sin‘(𝑁 · 𝑥)) ∈ ℂ)
161	160	mulid2d 10659	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → (1 · (sin‘(𝑁 · 𝑥))) = (sin‘(𝑁 · 𝑥)))
162	159, 161	eqtrd 2856	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (sin‘(𝑁 · 𝑥)))
163	162	mpteq2dva 5161	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (0(,)π) ↦ ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥)))) = (𝑥 ∈ (0(,)π) ↦ (sin‘(𝑁 · 𝑥))))
164		ioossicc 12823	. . . . . . 7 ⊢ (0(,)π) ⊆ (0[,]π)
165	164	a1i 11	. . . . . 6 ⊢ (𝜑 → (0(,)π) ⊆ (0[,]π))
166		ioombl 24166	. . . . . . 7 ⊢ (0(,)π) ∈ dom vol
167	166	a1i 11	. . . . . 6 ⊢ (𝜑 → (0(,)π) ∈ dom vol)
168	97	adantr 483	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (0[,]π)) → 𝑁 ∈ ℝ)
169		iccssre 12819	. . . . . . . . . . 11 ⊢ ((0 ∈ ℝ ∧ π ∈ ℝ) → (0[,]π) ⊆ ℝ)
170	5, 1, 169	mp2an 690	. . . . . . . . . 10 ⊢ (0[,]π) ⊆ ℝ
171	170	sseli 3963	. . . . . . . . 9 ⊢ (𝑥 ∈ (0[,]π) → 𝑥 ∈ ℝ)
172	171	adantl 484	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (0[,]π)) → 𝑥 ∈ ℝ)
173	168, 172	remulcld 10671	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (0[,]π)) → (𝑁 · 𝑥) ∈ ℝ)
174	173	resincld 15496	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (0[,]π)) → (sin‘(𝑁 · 𝑥)) ∈ ℝ)
175	170, 116	sstri 3976	. . . . . . . . . . 11 ⊢ (0[,]π) ⊆ ℂ
176	175	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → (0[,]π) ⊆ ℂ)
177	176, 25, 120	constcncfg 42203	. . . . . . . . 9 ⊢ (𝜑 → (𝑥 ∈ (0[,]π) ↦ 𝑁) ∈ ((0[,]π)–cn→ℂ))
178	176, 120	idcncfg 42204	. . . . . . . . 9 ⊢ (𝜑 → (𝑥 ∈ (0[,]π) ↦ 𝑥) ∈ ((0[,]π)–cn→ℂ))
179	177, 178	mulcncf 24047	. . . . . . . 8 ⊢ (𝜑 → (𝑥 ∈ (0[,]π) ↦ (𝑁 · 𝑥)) ∈ ((0[,]π)–cn→ℂ))
180	115, 179	cncfmpt1f 23521	. . . . . . 7 ⊢ (𝜑 → (𝑥 ∈ (0[,]π) ↦ (sin‘(𝑁 · 𝑥))) ∈ ((0[,]π)–cn→ℂ))
181		cniccibl 24441	. . . . . . 7 ⊢ ((0 ∈ ℝ ∧ π ∈ ℝ ∧ (𝑥 ∈ (0[,]π) ↦ (sin‘(𝑁 · 𝑥))) ∈ ((0[,]π)–cn→ℂ)) → (𝑥 ∈ (0[,]π) ↦ (sin‘(𝑁 · 𝑥))) ∈ 𝐿¹)
182	113, 4, 180, 181	syl3anc 1367	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ (0[,]π) ↦ (sin‘(𝑁 · 𝑥))) ∈ 𝐿¹)
183	165, 167, 174, 182	iblss 24405	. . . . 5 ⊢ (𝜑 → (𝑥 ∈ (0(,)π) ↦ (sin‘(𝑁 · 𝑥))) ∈ 𝐿¹)
184	163, 183	eqeltrd 2913	. . . 4 ⊢ (𝜑 → (𝑥 ∈ (0(,)π) ↦ ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥)))) ∈ 𝐿¹)
185	3, 4, 12, 30, 129, 184	itgsplitioo 24438	. . 3 ⊢ (𝜑 → ∫(-π(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 = (∫(-π(,)0)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 + ∫(0(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥))
186	185	oveq1d 7171	. 2 ⊢ (𝜑 → (∫(-π(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 / π) = ((∫(-π(,)0)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 + ∫(0(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥) / π))
187	91	oveq1d 7171	. . . . . . . . 9 ⊢ (𝑥 ∈ (-π(,)0) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (-1 · (sin‘(𝑁 · 𝑥))))
188	187	adantl 484	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (-1 · (sin‘(𝑁 · 𝑥))))
189	60	a1i 11	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (-π(,)0) → -π ∈ ℝ^*)
190	131	a1i 11	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (-π(,)0) → π ∈ ℝ^*)
191	31, 72, 33, 77, 73	lttrd 10801	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (-π(,)0) → 𝑥 < π)
192	189, 190, 31, 63, 191	eliood 41822	. . . . . . . . . 10 ⊢ (𝑥 ∈ (-π(,)0) → 𝑥 ∈ (-π(,)π))
193	192, 29	sylan2 594	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → (sin‘(𝑁 · 𝑥)) ∈ ℂ)
194	193	mulm1d 11092	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → (-1 · (sin‘(𝑁 · 𝑥))) = -(sin‘(𝑁 · 𝑥)))
195	188, 194	eqtrd 2856	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (-π(,)0)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = -(sin‘(𝑁 · 𝑥)))
196	195	itgeq2dv 24382	. . . . . 6 ⊢ (𝜑 → ∫(-π(,)0)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 = ∫(-π(,)0)-(sin‘(𝑁 · 𝑥)) d𝑥)
197	101, 127	itgneg 24404	. . . . . 6 ⊢ (𝜑 → -∫(-π(,)0)(sin‘(𝑁 · 𝑥)) d𝑥 = ∫(-π(,)0)-(sin‘(𝑁 · 𝑥)) d𝑥)
198	24	nnne0d 11688	. . . . . . . . . 10 ⊢ (𝜑 → 𝑁 ≠ 0)
199	7	a1i 11	. . . . . . . . . 10 ⊢ (𝜑 → -π ≤ 0)
200	25, 198, 3, 113, 199	itgsincmulx 42308	. . . . . . . . 9 ⊢ (𝜑 → ∫(-π(,)0)(sin‘(𝑁 · 𝑥)) d𝑥 = (((cos‘(𝑁 · -π)) − (cos‘(𝑁 · 0))) / 𝑁))
201	24	nnzd 12087	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝑁 ∈ ℤ)
202		cosknegpi 42199	. . . . . . . . . . . . 13 ⊢ (𝑁 ∈ ℤ → (cos‘(𝑁 · -π)) = if(2 ∥ 𝑁, 1, -1))
203	201, 202	syl 17	. . . . . . . . . . . 12 ⊢ (𝜑 → (cos‘(𝑁 · -π)) = if(2 ∥ 𝑁, 1, -1))
204	25	mul01d 10839	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝑁 · 0) = 0)
205	204	fveq2d 6674	. . . . . . . . . . . . 13 ⊢ (𝜑 → (cos‘(𝑁 · 0)) = (cos‘0))
206		cos0 15503	. . . . . . . . . . . . 13 ⊢ (cos‘0) = 1
207	205, 206	syl6eq 2872	. . . . . . . . . . . 12 ⊢ (𝜑 → (cos‘(𝑁 · 0)) = 1)
208	203, 207	oveq12d 7174	. . . . . . . . . . 11 ⊢ (𝜑 → ((cos‘(𝑁 · -π)) − (cos‘(𝑁 · 0))) = (if(2 ∥ 𝑁, 1, -1) − 1))
209		1m1e0 11710	. . . . . . . . . . . . 13 ⊢ (1 − 1) = 0
210		iftrue 4473	. . . . . . . . . . . . . 14 ⊢ (2 ∥ 𝑁 → if(2 ∥ 𝑁, 1, -1) = 1)
211	210	oveq1d 7171	. . . . . . . . . . . . 13 ⊢ (2 ∥ 𝑁 → (if(2 ∥ 𝑁, 1, -1) − 1) = (1 − 1))
212		iftrue 4473	. . . . . . . . . . . . 13 ⊢ (2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, -2) = 0)
213	209, 211, 212	3eqtr4a 2882	. . . . . . . . . . . 12 ⊢ (2 ∥ 𝑁 → (if(2 ∥ 𝑁, 1, -1) − 1) = if(2 ∥ 𝑁, 0, -2))
214		iffalse 4476	. . . . . . . . . . . . . 14 ⊢ (¬ 2 ∥ 𝑁 → if(2 ∥ 𝑁, 1, -1) = -1)
215	214	oveq1d 7171	. . . . . . . . . . . . 13 ⊢ (¬ 2 ∥ 𝑁 → (if(2 ∥ 𝑁, 1, -1) − 1) = (-1 − 1))
216		ax-1cn 10595	. . . . . . . . . . . . . . . 16 ⊢ 1 ∈ ℂ
217		negdi2 10944	. . . . . . . . . . . . . . . 16 ⊢ ((1 ∈ ℂ ∧ 1 ∈ ℂ) → -(1 + 1) = (-1 − 1))
218	216, 216, 217	mp2an 690	. . . . . . . . . . . . . . 15 ⊢ -(1 + 1) = (-1 − 1)
219	218	eqcomi 2830	. . . . . . . . . . . . . 14 ⊢ (-1 − 1) = -(1 + 1)
220	219	a1i 11	. . . . . . . . . . . . 13 ⊢ (¬ 2 ∥ 𝑁 → (-1 − 1) = -(1 + 1))
221		iffalse 4476	. . . . . . . . . . . . . 14 ⊢ (¬ 2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, -2) = -2)
222		1p1e2 11763	. . . . . . . . . . . . . . 15 ⊢ (1 + 1) = 2
223	222	negeqi 10879	. . . . . . . . . . . . . 14 ⊢ -(1 + 1) = -2
224	221, 223	syl6reqr 2875	. . . . . . . . . . . . 13 ⊢ (¬ 2 ∥ 𝑁 → -(1 + 1) = if(2 ∥ 𝑁, 0, -2))
225	215, 220, 224	3eqtrd 2860	. . . . . . . . . . . 12 ⊢ (¬ 2 ∥ 𝑁 → (if(2 ∥ 𝑁, 1, -1) − 1) = if(2 ∥ 𝑁, 0, -2))
226	213, 225	pm2.61i 184	. . . . . . . . . . 11 ⊢ (if(2 ∥ 𝑁, 1, -1) − 1) = if(2 ∥ 𝑁, 0, -2)
227	208, 226	syl6eq 2872	. . . . . . . . . 10 ⊢ (𝜑 → ((cos‘(𝑁 · -π)) − (cos‘(𝑁 · 0))) = if(2 ∥ 𝑁, 0, -2))
228	227	oveq1d 7171	. . . . . . . . 9 ⊢ (𝜑 → (((cos‘(𝑁 · -π)) − (cos‘(𝑁 · 0))) / 𝑁) = (if(2 ∥ 𝑁, 0, -2) / 𝑁))
229	200, 228	eqtrd 2856	. . . . . . . 8 ⊢ (𝜑 → ∫(-π(,)0)(sin‘(𝑁 · 𝑥)) d𝑥 = (if(2 ∥ 𝑁, 0, -2) / 𝑁))
230	229	negeqd 10880	. . . . . . 7 ⊢ (𝜑 → -∫(-π(,)0)(sin‘(𝑁 · 𝑥)) d𝑥 = -(if(2 ∥ 𝑁, 0, -2) / 𝑁))
231		0cn 10633	. . . . . . . . . 10 ⊢ 0 ∈ ℂ
232		2cn 11713	. . . . . . . . . . 11 ⊢ 2 ∈ ℂ
233	232	negcli 10954	. . . . . . . . . 10 ⊢ -2 ∈ ℂ
234	231, 233	ifcli 4513	. . . . . . . . 9 ⊢ if(2 ∥ 𝑁, 0, -2) ∈ ℂ
235	234	a1i 11	. . . . . . . 8 ⊢ (𝜑 → if(2 ∥ 𝑁, 0, -2) ∈ ℂ)
236	235, 25, 198	divnegd 11429	. . . . . . 7 ⊢ (𝜑 → -(if(2 ∥ 𝑁, 0, -2) / 𝑁) = (-if(2 ∥ 𝑁, 0, -2) / 𝑁))
237		neg0 10932	. . . . . . . . . . 11 ⊢ -0 = 0
238	212	negeqd 10880	. . . . . . . . . . 11 ⊢ (2 ∥ 𝑁 → -if(2 ∥ 𝑁, 0, -2) = -0)
239		iftrue 4473	. . . . . . . . . . 11 ⊢ (2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, 2) = 0)
240	237, 238, 239	3eqtr4a 2882	. . . . . . . . . 10 ⊢ (2 ∥ 𝑁 → -if(2 ∥ 𝑁, 0, -2) = if(2 ∥ 𝑁, 0, 2))
241	232	negnegi 10956	. . . . . . . . . . 11 ⊢ --2 = 2
242	221	negeqd 10880	. . . . . . . . . . 11 ⊢ (¬ 2 ∥ 𝑁 → -if(2 ∥ 𝑁, 0, -2) = --2)
243		iffalse 4476	. . . . . . . . . . 11 ⊢ (¬ 2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, 2) = 2)
244	241, 242, 243	3eqtr4a 2882	. . . . . . . . . 10 ⊢ (¬ 2 ∥ 𝑁 → -if(2 ∥ 𝑁, 0, -2) = if(2 ∥ 𝑁, 0, 2))
245	240, 244	pm2.61i 184	. . . . . . . . 9 ⊢ -if(2 ∥ 𝑁, 0, -2) = if(2 ∥ 𝑁, 0, 2)
246	245	oveq1i 7166	. . . . . . . 8 ⊢ (-if(2 ∥ 𝑁, 0, -2) / 𝑁) = (if(2 ∥ 𝑁, 0, 2) / 𝑁)
247	246	a1i 11	. . . . . . 7 ⊢ (𝜑 → (-if(2 ∥ 𝑁, 0, -2) / 𝑁) = (if(2 ∥ 𝑁, 0, 2) / 𝑁))
248	230, 236, 247	3eqtrd 2860	. . . . . 6 ⊢ (𝜑 → -∫(-π(,)0)(sin‘(𝑁 · 𝑥)) d𝑥 = (if(2 ∥ 𝑁, 0, 2) / 𝑁))
249	196, 197, 248	3eqtr2d 2862	. . . . 5 ⊢ (𝜑 → ∫(-π(,)0)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 = (if(2 ∥ 𝑁, 0, 2) / 𝑁))
250	133, 17, 19	sylancl 588	. . . . . . . . . . 11 ⊢ (𝑥 ∈ (0(,)π) → (𝐹‘𝑥) = if((𝑥 mod 𝑇) < π, 1, -1))
251	250, 156	eqtrd 2856	. . . . . . . . . 10 ⊢ (𝑥 ∈ (0(,)π) → (𝐹‘𝑥) = 1)
252	251	oveq1d 7171	. . . . . . . . 9 ⊢ (𝑥 ∈ (0(,)π) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (1 · (sin‘(𝑁 · 𝑥))))
253	252	adantl 484	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (1 · (sin‘(𝑁 · 𝑥))))
254	253, 161	eqtrd 2856	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (0(,)π)) → ((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) = (sin‘(𝑁 · 𝑥)))
255	254	itgeq2dv 24382	. . . . . 6 ⊢ (𝜑 → ∫(0(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 = ∫(0(,)π)(sin‘(𝑁 · 𝑥)) d𝑥)
256	9	a1i 11	. . . . . . 7 ⊢ (𝜑 → 0 ≤ π)
257	25, 198, 113, 4, 256	itgsincmulx 42308	. . . . . 6 ⊢ (𝜑 → ∫(0(,)π)(sin‘(𝑁 · 𝑥)) d𝑥 = (((cos‘(𝑁 · 0)) − (cos‘(𝑁 · π))) / 𝑁))
258		coskpi2 42196	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → (cos‘(𝑁 · π)) = if(2 ∥ 𝑁, 1, -1))
259	201, 258	syl 17	. . . . . . . . 9 ⊢ (𝜑 → (cos‘(𝑁 · π)) = if(2 ∥ 𝑁, 1, -1))
260	207, 259	oveq12d 7174	. . . . . . . 8 ⊢ (𝜑 → ((cos‘(𝑁 · 0)) − (cos‘(𝑁 · π))) = (1 − if(2 ∥ 𝑁, 1, -1)))
261	210	oveq2d 7172	. . . . . . . . . 10 ⊢ (2 ∥ 𝑁 → (1 − if(2 ∥ 𝑁, 1, -1)) = (1 − 1))
262	209, 261, 239	3eqtr4a 2882	. . . . . . . . 9 ⊢ (2 ∥ 𝑁 → (1 − if(2 ∥ 𝑁, 1, -1)) = if(2 ∥ 𝑁, 0, 2))
263	214	oveq2d 7172	. . . . . . . . . 10 ⊢ (¬ 2 ∥ 𝑁 → (1 − if(2 ∥ 𝑁, 1, -1)) = (1 − -1))
264	216, 216	subnegi 10965	. . . . . . . . . . 11 ⊢ (1 − -1) = (1 + 1)
265	264	a1i 11	. . . . . . . . . 10 ⊢ (¬ 2 ∥ 𝑁 → (1 − -1) = (1 + 1))
266	243, 222	syl6reqr 2875	. . . . . . . . . 10 ⊢ (¬ 2 ∥ 𝑁 → (1 + 1) = if(2 ∥ 𝑁, 0, 2))
267	263, 265, 266	3eqtrd 2860	. . . . . . . . 9 ⊢ (¬ 2 ∥ 𝑁 → (1 − if(2 ∥ 𝑁, 1, -1)) = if(2 ∥ 𝑁, 0, 2))
268	262, 267	pm2.61i 184	. . . . . . . 8 ⊢ (1 − if(2 ∥ 𝑁, 1, -1)) = if(2 ∥ 𝑁, 0, 2)
269	260, 268	syl6eq 2872	. . . . . . 7 ⊢ (𝜑 → ((cos‘(𝑁 · 0)) − (cos‘(𝑁 · π))) = if(2 ∥ 𝑁, 0, 2))
270	269	oveq1d 7171	. . . . . 6 ⊢ (𝜑 → (((cos‘(𝑁 · 0)) − (cos‘(𝑁 · π))) / 𝑁) = (if(2 ∥ 𝑁, 0, 2) / 𝑁))
271	255, 257, 270	3eqtrd 2860	. . . . 5 ⊢ (𝜑 → ∫(0(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 = (if(2 ∥ 𝑁, 0, 2) / 𝑁))
272	249, 271	oveq12d 7174	. . . 4 ⊢ (𝜑 → (∫(-π(,)0)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 + ∫(0(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥) = ((if(2 ∥ 𝑁, 0, 2) / 𝑁) + (if(2 ∥ 𝑁, 0, 2) / 𝑁)))
273	231, 232	ifcli 4513	. . . . . 6 ⊢ if(2 ∥ 𝑁, 0, 2) ∈ ℂ
274	273	a1i 11	. . . . 5 ⊢ (𝜑 → if(2 ∥ 𝑁, 0, 2) ∈ ℂ)
275	274, 274, 25, 198	divdird 11454	. . . 4 ⊢ (𝜑 → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = ((if(2 ∥ 𝑁, 0, 2) / 𝑁) + (if(2 ∥ 𝑁, 0, 2) / 𝑁)))
276	239, 239	oveq12d 7174	. . . . . . . . 9 ⊢ (2 ∥ 𝑁 → (if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) = (0 + 0))
277		00id 10815	. . . . . . . . 9 ⊢ (0 + 0) = 0
278	276, 277	syl6eq 2872	. . . . . . . 8 ⊢ (2 ∥ 𝑁 → (if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) = 0)
279	278	oveq1d 7171	. . . . . . 7 ⊢ (2 ∥ 𝑁 → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = (0 / 𝑁))
280	279	adantl 484	. . . . . 6 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = (0 / 𝑁))
281	25, 198	div0d 11415	. . . . . . 7 ⊢ (𝜑 → (0 / 𝑁) = 0)
282	281	adantr 483	. . . . . 6 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → (0 / 𝑁) = 0)
283		iftrue 4473	. . . . . . . 8 ⊢ (2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, (4 / 𝑁)) = 0)
284	283	eqcomd 2827	. . . . . . 7 ⊢ (2 ∥ 𝑁 → 0 = if(2 ∥ 𝑁, 0, (4 / 𝑁)))
285	284	adantl 484	. . . . . 6 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → 0 = if(2 ∥ 𝑁, 0, (4 / 𝑁)))
286	280, 282, 285	3eqtrd 2860	. . . . 5 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = if(2 ∥ 𝑁, 0, (4 / 𝑁)))
287	243, 243	oveq12d 7174	. . . . . . . . 9 ⊢ (¬ 2 ∥ 𝑁 → (if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) = (2 + 2))
288		2p2e4 11773	. . . . . . . . 9 ⊢ (2 + 2) = 4
289	287, 288	syl6eq 2872	. . . . . . . 8 ⊢ (¬ 2 ∥ 𝑁 → (if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) = 4)
290	289	oveq1d 7171	. . . . . . 7 ⊢ (¬ 2 ∥ 𝑁 → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = (4 / 𝑁))
291		iffalse 4476	. . . . . . 7 ⊢ (¬ 2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, (4 / 𝑁)) = (4 / 𝑁))
292	290, 291	eqtr4d 2859	. . . . . 6 ⊢ (¬ 2 ∥ 𝑁 → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = if(2 ∥ 𝑁, 0, (4 / 𝑁)))
293	292	adantl 484	. . . . 5 ⊢ ((𝜑 ∧ ¬ 2 ∥ 𝑁) → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = if(2 ∥ 𝑁, 0, (4 / 𝑁)))
294	286, 293	pm2.61dan 811	. . . 4 ⊢ (𝜑 → ((if(2 ∥ 𝑁, 0, 2) + if(2 ∥ 𝑁, 0, 2)) / 𝑁) = if(2 ∥ 𝑁, 0, (4 / 𝑁)))
295	272, 275, 294	3eqtr2d 2862	. . 3 ⊢ (𝜑 → (∫(-π(,)0)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 + ∫(0(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥) = if(2 ∥ 𝑁, 0, (4 / 𝑁)))
296	295	oveq1d 7171	. 2 ⊢ (𝜑 → ((∫(-π(,)0)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 + ∫(0(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥) / π) = (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π))
297	283	oveq1d 7171	. . . . 5 ⊢ (2 ∥ 𝑁 → (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π) = (0 / π))
298	297	adantl 484	. . . 4 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π) = (0 / π))
299	5, 8	gtneii 10752	. . . . . 6 ⊢ π ≠ 0
300	42, 299	div0i 11374	. . . . 5 ⊢ (0 / π) = 0
301	300	a1i 11	. . . 4 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → (0 / π) = 0)
302		iftrue 4473	. . . . . 6 ⊢ (2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))) = 0)
303	302	eqcomd 2827	. . . . 5 ⊢ (2 ∥ 𝑁 → 0 = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))
304	303	adantl 484	. . . 4 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → 0 = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))
305	298, 301, 304	3eqtrd 2860	. . 3 ⊢ ((𝜑 ∧ 2 ∥ 𝑁) → (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π) = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))
306	291	oveq1d 7171	. . . . 5 ⊢ (¬ 2 ∥ 𝑁 → (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π) = ((4 / 𝑁) / π))
307	306	adantl 484	. . . 4 ⊢ ((𝜑 ∧ ¬ 2 ∥ 𝑁) → (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π) = ((4 / 𝑁) / π))
308		4cn 11723	. . . . . . 7 ⊢ 4 ∈ ℂ
309	308	a1i 11	. . . . . 6 ⊢ (𝜑 → 4 ∈ ℂ)
310	42	a1i 11	. . . . . 6 ⊢ (𝜑 → π ∈ ℂ)
311	299	a1i 11	. . . . . 6 ⊢ (𝜑 → π ≠ 0)
312	309, 25, 310, 198, 311	divdiv1d 11447	. . . . 5 ⊢ (𝜑 → ((4 / 𝑁) / π) = (4 / (𝑁 · π)))
313	312	adantr 483	. . . 4 ⊢ ((𝜑 ∧ ¬ 2 ∥ 𝑁) → ((4 / 𝑁) / π) = (4 / (𝑁 · π)))
314		iffalse 4476	. . . . . 6 ⊢ (¬ 2 ∥ 𝑁 → if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))) = (4 / (𝑁 · π)))
315	314	eqcomd 2827	. . . . 5 ⊢ (¬ 2 ∥ 𝑁 → (4 / (𝑁 · π)) = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))
316	315	adantl 484	. . . 4 ⊢ ((𝜑 ∧ ¬ 2 ∥ 𝑁) → (4 / (𝑁 · π)) = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))
317	307, 313, 316	3eqtrd 2860	. . 3 ⊢ ((𝜑 ∧ ¬ 2 ∥ 𝑁) → (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π) = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))
318	305, 317	pm2.61dan 811	. 2 ⊢ (𝜑 → (if(2 ∥ 𝑁, 0, (4 / 𝑁)) / π) = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))
319	186, 296, 318	3eqtrd 2860	1 ⊢ (𝜑 → (∫(-π(,)π)((𝐹‘𝑥) · (sin‘(𝑁 · 𝑥))) d𝑥 / π) = if(2 ∥ 𝑁, 0, (4 / (𝑁 · π))))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ≠ wne 3016 ⊆ wss 3936 ifcif 4467 class class class wbr 5066 ↦ cmpt 5146 dom cdm 5555 ‘cfv 6355 (class class class)co 7156 ℂcc 10535 ℝcr 10536 0cc0 10537 1c1 10538 + caddc 10540 · cmul 10542 ℝ^*cxr 10674 < clt 10675 ≤ cle 10676 − cmin 10870 -cneg 10871 / cdiv 11297 ℕcn 11638 2c2 11693 4c4 11695 ℤcz 11982 ℝ⁺crp 12390 (,)cioo 12739 [,]cicc 12742 mod cmo 13238 sincsin 15417 cosccos 15418 πcpi 15420 ∥ cdvds 15607 –cn→ccncf 23484 volcvol 24064 𝐿¹cibl 24218 ∫citg 24219

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 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-inf2 9104 ax-cc 9857 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 ax-pre-sup 10615 ax-addf 10616 ax-mulf 10617

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-fal 1550 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-symdif 4219 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-iun 4921 df-iin 4922 df-disj 5032 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-se 5515 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-isom 6364 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-of 7409 df-ofr 7410 df-om 7581 df-1st 7689 df-2nd 7690 df-supp 7831 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-1o 8102 df-2o 8103 df-oadd 8106 df-omul 8107 df-er 8289 df-map 8408 df-pm 8409 df-ixp 8462 df-en 8510 df-dom 8511 df-sdom 8512 df-fin 8513 df-fsupp 8834 df-fi 8875 df-sup 8906 df-inf 8907 df-oi 8974 df-dju 9330 df-card 9368 df-acn 9371 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-div 11298 df-nn 11639 df-2 11701 df-3 11702 df-4 11703 df-5 11704 df-6 11705 df-7 11706 df-8 11707 df-9 11708 df-n0 11899 df-z 11983 df-dec 12100 df-uz 12245 df-q 12350 df-rp 12391 df-xneg 12508 df-xadd 12509 df-xmul 12510 df-ioo 12743 df-ioc 12744 df-ico 12745 df-icc 12746 df-fz 12894 df-fzo 13035 df-fl 13163 df-mod 13239 df-seq 13371 df-exp 13431 df-fac 13635 df-bc 13664 df-hash 13692 df-shft 14426 df-cj 14458 df-re 14459 df-im 14460 df-sqrt 14594 df-abs 14595 df-limsup 14828 df-clim 14845 df-rlim 14846 df-sum 15043 df-ef 15421 df-sin 15423 df-cos 15424 df-pi 15426 df-dvds 15608 df-struct 16485 df-ndx 16486 df-slot 16487 df-base 16489 df-sets 16490 df-ress 16491 df-plusg 16578 df-mulr 16579 df-starv 16580 df-sca 16581 df-vsca 16582 df-ip 16583 df-tset 16584 df-ple 16585 df-ds 16587 df-unif 16588 df-hom 16589 df-cco 16590 df-rest 16696 df-topn 16697 df-0g 16715 df-gsum 16716 df-topgen 16717 df-pt 16718 df-prds 16721 df-xrs 16775 df-qtop 16780 df-imas 16781 df-xps 16783 df-mre 16857 df-mrc 16858 df-acs 16860 df-mgm 17852 df-sgrp 17901 df-mnd 17912 df-submnd 17957 df-mulg 18225 df-cntz 18447 df-cmn 18908 df-psmet 20537 df-xmet 20538 df-met 20539 df-bl 20540 df-mopn 20541 df-fbas 20542 df-fg 20543 df-cnfld 20546 df-top 21502 df-topon 21519 df-topsp 21541 df-bases 21554 df-cld 21627 df-ntr 21628 df-cls 21629 df-nei 21706 df-lp 21744 df-perf 21745 df-cn 21835 df-cnp 21836 df-haus 21923 df-cmp 21995 df-tx 22170 df-hmeo 22363 df-fil 22454 df-fm 22546 df-flim 22547 df-flf 22548 df-xms 22930 df-ms 22931 df-tms 22932 df-cncf 23486 df-ovol 24065 df-vol 24066 df-mbf 24220 df-itg1 24221 df-itg2 24222 df-ibl 24223 df-itg 24224 df-0p 24271 df-limc 24464 df-dv 24465

This theorem is referenced by: fouriersw 42565

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