readvcot - Mathbox for Steven Nguyen

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Theorem readvcot 42728

Description: Real antiderivative of cotangent. (Contributed by SN, 7-Oct-2025.)

**Hypothesis**
Ref	Expression
readvcot.d	⊢ 𝐷 = {𝑦 ∈ ℝ ∣ (sin‘𝑦) ≠ 0}

**Assertion**
Ref	Expression
readvcot	⊢ (ℝ D (𝑥 ∈ 𝐷 ↦ (log‘(abs‘(sin‘𝑥))))) = (𝑥 ∈ 𝐷 ↦ ((cos‘𝑥) / (sin‘𝑥)))

Distinct variable groups: 𝑥,𝐷 𝑥,𝑦 Allowed substitution hint: 𝐷(𝑦)

Proof of Theorem readvcot Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		reelprrecn 11130	. . . . 5 ⊢ ℝ ∈ {ℝ, ℂ}
2	1	a1i 11	. . . 4 ⊢ (⊤ → ℝ ∈ {ℝ, ℂ})
3		fveq2 6842	. . . . . . . 8 ⊢ (𝑦 = 𝑥 → (sin‘𝑦) = (sin‘𝑥))
4	3	neeq1d 2992	. . . . . . 7 ⊢ (𝑦 = 𝑥 → ((sin‘𝑦) ≠ 0 ↔ (sin‘𝑥) ≠ 0))
5		readvcot.d	. . . . . . 7 ⊢ 𝐷 = {𝑦 ∈ ℝ ∣ (sin‘𝑦) ≠ 0}
6	4, 5	elrab2 3651	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 ↔ (𝑥 ∈ ℝ ∧ (sin‘𝑥) ≠ 0))
7		resincl 16077	. . . . . . . 8 ⊢ (𝑥 ∈ ℝ → (sin‘𝑥) ∈ ℝ)
8	7	adantr 480	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ (sin‘𝑥) ≠ 0) → (sin‘𝑥) ∈ ℝ)
9		simpr 484	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ ∧ (sin‘𝑥) ≠ 0) → (sin‘𝑥) ≠ 0)
10	8, 9	eldifsnd 4745	. . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ (sin‘𝑥) ≠ 0) → (sin‘𝑥) ∈ (ℝ ∖ {0}))
11	6, 10	sylbi 217	. . . . 5 ⊢ (𝑥 ∈ 𝐷 → (sin‘𝑥) ∈ (ℝ ∖ {0}))
12	11	adantl 481	. . . 4 ⊢ ((⊤ ∧ 𝑥 ∈ 𝐷) → (sin‘𝑥) ∈ (ℝ ∖ {0}))
13		fvexd 6857	. . . 4 ⊢ ((⊤ ∧ 𝑥 ∈ 𝐷) → (cos‘𝑥) ∈ V)
14		eldifi 4085	. . . . . . . . 9 ⊢ (𝑧 ∈ (ℝ ∖ {0}) → 𝑧 ∈ ℝ)
15	14	adantl 481	. . . . . . . 8 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → 𝑧 ∈ ℝ)
16	15	recnd 11172	. . . . . . 7 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → 𝑧 ∈ ℂ)
17	16	abscld 15374	. . . . . 6 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → (abs‘𝑧) ∈ ℝ)
18	17	recnd 11172	. . . . 5 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → (abs‘𝑧) ∈ ℂ)
19		eldifsni 4748	. . . . . . 7 ⊢ (𝑧 ∈ (ℝ ∖ {0}) → 𝑧 ≠ 0)
20	19	adantl 481	. . . . . 6 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → 𝑧 ≠ 0)
21	16, 20	absne0d 15385	. . . . 5 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → (abs‘𝑧) ≠ 0)
22	18, 21	logcld 26547	. . . 4 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → (log‘(abs‘𝑧)) ∈ ℂ)
23		ovexd 7403	. . . 4 ⊢ ((⊤ ∧ 𝑧 ∈ (ℝ ∖ {0})) → (1 / 𝑧) ∈ V)
24	7	recnd 11172	. . . . . 6 ⊢ (𝑥 ∈ ℝ → (sin‘𝑥) ∈ ℂ)
25	24	adantl 481	. . . . 5 ⊢ ((⊤ ∧ 𝑥 ∈ ℝ) → (sin‘𝑥) ∈ ℂ)
26		fvexd 6857	. . . . 5 ⊢ ((⊤ ∧ 𝑥 ∈ ℝ) → (cos‘𝑥) ∈ V)
27		eqid 2737	. . . . . 6 ⊢ (TopOpen‘ℂ_fld) = (TopOpen‘ℂ_fld)
28		cnopn 24742	. . . . . . 7 ⊢ ℂ ∈ (TopOpen‘ℂ_fld)
29	28	a1i 11	. . . . . 6 ⊢ (⊤ → ℂ ∈ (TopOpen‘ℂ_fld))
30		ax-resscn 11095	. . . . . . . 8 ⊢ ℝ ⊆ ℂ
31		dfss2 3921	. . . . . . . 8 ⊢ (ℝ ⊆ ℂ ↔ (ℝ ∩ ℂ) = ℝ)
32	30, 31	mpbi 230	. . . . . . 7 ⊢ (ℝ ∩ ℂ) = ℝ
33	32	a1i 11	. . . . . 6 ⊢ (⊤ → (ℝ ∩ ℂ) = ℝ)
34		sincl 16063	. . . . . . 7 ⊢ (𝑥 ∈ ℂ → (sin‘𝑥) ∈ ℂ)
35	34	adantl 481	. . . . . 6 ⊢ ((⊤ ∧ 𝑥 ∈ ℂ) → (sin‘𝑥) ∈ ℂ)
36		fvexd 6857	. . . . . 6 ⊢ ((⊤ ∧ 𝑥 ∈ ℂ) → (cos‘𝑥) ∈ V)
37		dvsin 25954	. . . . . . 7 ⊢ (ℂ D sin) = cos
38		sinf 16061	. . . . . . . . . 10 ⊢ sin:ℂ⟶ℂ
39	38	a1i 11	. . . . . . . . 9 ⊢ (⊤ → sin:ℂ⟶ℂ)
40	39	feqmptd 6910	. . . . . . . 8 ⊢ (⊤ → sin = (𝑥 ∈ ℂ ↦ (sin‘𝑥)))
41	40	oveq2d 7384	. . . . . . 7 ⊢ (⊤ → (ℂ D sin) = (ℂ D (𝑥 ∈ ℂ ↦ (sin‘𝑥))))
42		cosf 16062	. . . . . . . . 9 ⊢ cos:ℂ⟶ℂ
43	42	a1i 11	. . . . . . . 8 ⊢ (⊤ → cos:ℂ⟶ℂ)
44	43	feqmptd 6910	. . . . . . 7 ⊢ (⊤ → cos = (𝑥 ∈ ℂ ↦ (cos‘𝑥)))
45	37, 41, 44	3eqtr3a 2796	. . . . . 6 ⊢ (⊤ → (ℂ D (𝑥 ∈ ℂ ↦ (sin‘𝑥))) = (𝑥 ∈ ℂ ↦ (cos‘𝑥)))
46	27, 2, 29, 33, 35, 36, 45	dvmptres3 25928	. . . . 5 ⊢ (⊤ → (ℝ D (𝑥 ∈ ℝ ↦ (sin‘𝑥))) = (𝑥 ∈ ℝ ↦ (cos‘𝑥)))
47	5	ssrab3 4036	. . . . . 6 ⊢ 𝐷 ⊆ ℝ
48	47	a1i 11	. . . . 5 ⊢ (⊤ → 𝐷 ⊆ ℝ)
49		tgioo4 24761	. . . . 5 ⊢ (topGen‘ran (,)) = ((TopOpen‘ℂ_fld) ↾_t ℝ)
50	5	resuppsinopn 42727	. . . . . 6 ⊢ 𝐷 ∈ (topGen‘ran (,))
51	50	a1i 11	. . . . 5 ⊢ (⊤ → 𝐷 ∈ (topGen‘ran (,)))
52	2, 25, 26, 46, 48, 49, 27, 51	dvmptres 25935	. . . 4 ⊢ (⊤ → (ℝ D (𝑥 ∈ 𝐷 ↦ (sin‘𝑥))) = (𝑥 ∈ 𝐷 ↦ (cos‘𝑥)))
53		eqid 2737	. . . . . 6 ⊢ (ℝ ∖ {0}) = (ℝ ∖ {0})
54	53	readvrec 42726	. . . . 5 ⊢ (ℝ D (𝑧 ∈ (ℝ ∖ {0}) ↦ (log‘(abs‘𝑧)))) = (𝑧 ∈ (ℝ ∖ {0}) ↦ (1 / 𝑧))
55	54	a1i 11	. . . 4 ⊢ (⊤ → (ℝ D (𝑧 ∈ (ℝ ∖ {0}) ↦ (log‘(abs‘𝑧)))) = (𝑧 ∈ (ℝ ∖ {0}) ↦ (1 / 𝑧)))
56		2fveq3 6847	. . . 4 ⊢ (𝑧 = (sin‘𝑥) → (log‘(abs‘𝑧)) = (log‘(abs‘(sin‘𝑥))))
57		oveq2 7376	. . . 4 ⊢ (𝑧 = (sin‘𝑥) → (1 / 𝑧) = (1 / (sin‘𝑥)))
58	2, 2, 12, 13, 22, 23, 52, 55, 56, 57	dvmptco 25944	. . 3 ⊢ (⊤ → (ℝ D (𝑥 ∈ 𝐷 ↦ (log‘(abs‘(sin‘𝑥))))) = (𝑥 ∈ 𝐷 ↦ ((1 / (sin‘𝑥)) · (cos‘𝑥))))
59	58	mptru 1549	. 2 ⊢ (ℝ D (𝑥 ∈ 𝐷 ↦ (log‘(abs‘(sin‘𝑥))))) = (𝑥 ∈ 𝐷 ↦ ((1 / (sin‘𝑥)) · (cos‘𝑥)))
60	6	simplbi 496	. . . . . 6 ⊢ (𝑥 ∈ 𝐷 → 𝑥 ∈ ℝ)
61	60	recoscld 16081	. . . . 5 ⊢ (𝑥 ∈ 𝐷 → (cos‘𝑥) ∈ ℝ)
62	61	recnd 11172	. . . 4 ⊢ (𝑥 ∈ 𝐷 → (cos‘𝑥) ∈ ℂ)
63	6, 8	sylbi 217	. . . . 5 ⊢ (𝑥 ∈ 𝐷 → (sin‘𝑥) ∈ ℝ)
64	63	recnd 11172	. . . 4 ⊢ (𝑥 ∈ 𝐷 → (sin‘𝑥) ∈ ℂ)
65	6, 9	sylbi 217	. . . 4 ⊢ (𝑥 ∈ 𝐷 → (sin‘𝑥) ≠ 0)
66	62, 64, 65	divrec2d 11933	. . 3 ⊢ (𝑥 ∈ 𝐷 → ((cos‘𝑥) / (sin‘𝑥)) = ((1 / (sin‘𝑥)) · (cos‘𝑥)))
67	66	mpteq2ia 5195	. 2 ⊢ (𝑥 ∈ 𝐷 ↦ ((cos‘𝑥) / (sin‘𝑥))) = (𝑥 ∈ 𝐷 ↦ ((1 / (sin‘𝑥)) · (cos‘𝑥)))
68	59, 67	eqtr4i 2763	1 ⊢ (ℝ D (𝑥 ∈ 𝐷 ↦ (log‘(abs‘(sin‘𝑥))))) = (𝑥 ∈ 𝐷 ↦ ((cos‘𝑥) / (sin‘𝑥)))

Colors of variables: wff setvar class

Syntax hints: ∧ wa 395 = wceq 1542 ⊤wtru 1543 ∈ wcel 2114 ≠ wne 2933 {crab 3401 Vcvv 3442 ∖ cdif 3900 ∩ cin 3902 ⊆ wss 3903 {csn 4582 {cpr 4584 ↦ cmpt 5181 ran crn 5633 ⟶wf 6496 ‘cfv 6500 (class class class)co 7368 ℂcc 11036 ℝcr 11037 0cc0 11038 1c1 11039 · cmul 11043 / cdiv 11806 (,)cioo 13273 abscabs 15169 sincsin 15998 cosccos 15999 TopOpenctopn 17353 topGenctg 17369 ℂ_fldccnfld 21321 D cdv 25832 logclog 26531

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-t1 23270 df-haus 23271 df-cmp 23343 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

This theorem is referenced by: (None)

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