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| Mirrors > Home > MPE Home > Th. List > tanval | Structured version Visualization version GIF version | ||
| Description: Value of the tangent function. (Contributed by Mario Carneiro, 14-Mar-2014.) |
| Ref | Expression |
|---|---|
| tanval | ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 488 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → 𝐴 ∈ ℂ) | |
| 2 | coscl 16221 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (cos‘𝐴) ∈ ℂ) | |
| 3 | 2 | anim1i 627 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → ((cos‘𝐴) ∈ ℂ ∧ (cos‘𝐴) ≠ 0)) |
| 4 | eldifsn 4751 | . . . 4 ⊢ ((cos‘𝐴) ∈ (ℂ ∖ {0}) ↔ ((cos‘𝐴) ∈ ℂ ∧ (cos‘𝐴) ≠ 0)) | |
| 5 | 3, 4 | sylibr 237 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (cos‘𝐴) ∈ (ℂ ∖ {0})) |
| 6 | cosf 16219 | . . . 4 ⊢ cos:ℂ⟶ℂ | |
| 7 | ffn 6706 | . . . 4 ⊢ (cos:ℂ⟶ℂ → cos Fn ℂ) | |
| 8 | elpreima 7054 | . . . 4 ⊢ (cos Fn ℂ → (𝐴 ∈ (◡cos “ (ℂ ∖ {0})) ↔ (𝐴 ∈ ℂ ∧ (cos‘𝐴) ∈ (ℂ ∖ {0})))) | |
| 9 | 6, 7, 8 | mp2b 10 | . . 3 ⊢ (𝐴 ∈ (◡cos “ (ℂ ∖ {0})) ↔ (𝐴 ∈ ℂ ∧ (cos‘𝐴) ∈ (ℂ ∖ {0}))) |
| 10 | 1, 5, 9 | sylanbrc 595 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → 𝐴 ∈ (◡cos “ (ℂ ∖ {0}))) |
| 11 | fveq2 6882 | . . . 4 ⊢ (𝑥 = 𝐴 → (sin‘𝑥) = (sin‘𝐴)) | |
| 12 | fveq2 6882 | . . . 4 ⊢ (𝑥 = 𝐴 → (cos‘𝑥) = (cos‘𝐴)) | |
| 13 | 11, 12 | oveq12d 7435 | . . 3 ⊢ (𝑥 = 𝐴 → ((sin‘𝑥) / (cos‘𝑥)) = ((sin‘𝐴) / (cos‘𝐴))) |
| 14 | df-tan 16163 | . . 3 ⊢ tan = (𝑥 ∈ (◡cos “ (ℂ ∖ {0})) ↦ ((sin‘𝑥) / (cos‘𝑥))) | |
| 15 | ovex 7450 | . . 3 ⊢ ((sin‘𝐴) / (cos‘𝐴)) ∈ V | |
| 16 | 13, 14, 15 | fvmpt 6990 | . 2 ⊢ (𝐴 ∈ (◡cos “ (ℂ ∖ {0})) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴))) |
| 17 | 10, 16 | syl 18 | 1 ⊢ ((𝐴 ∈ ℂ ∧ (cos‘𝐴) ≠ 0) → (tan‘𝐴) = ((sin‘𝐴) / (cos‘𝐴))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2957 ∖ cdif 3899 {csn 4587 ◡ccnv 5658 “ cima 5662 Fn wfn 6532 ⟶wf 6533 ‘cfv 6537 (class class class)co 7417 ℂcc 11126 0cc0 11128 / cdiv 11899 sincsin 16155 cosccos 16156 tanctan 16157 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-inf2 9624 ax-cnex 11184 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 ax-pre-mulgt0 11205 ax-pre-sup 11206 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-se 5613 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-isom 6546 df-riota 7374 df-ov 7420 df-oprab 7421 df-mpo 7422 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-1o 8459 df-er 8700 df-pm 8833 df-en 8957 df-dom 8958 df-sdom 8959 df-fin 8960 df-sup 9416 df-inf 9417 df-oi 9486 df-card 9948 df-pnf 11273 df-mnf 11274 df-xr 11275 df-ltxr 11276 df-le 11277 df-sub 11471 df-neg 11472 df-div 11900 df-nn 12262 df-2 12331 df-3 12332 df-n0 12533 df-z 12620 df-uz 12892 df-rp 13047 df-ico 13408 df-fz 13566 df-fzo 13714 df-fl 13857 df-seq 14070 df-exp 14130 df-fac 14342 df-hash 14399 df-shft 15144 df-cj 15190 df-re 15191 df-im 15192 df-sqrt 15326 df-abs 15327 df-limsup 15562 df-clim 15579 df-rlim 15580 df-sum 15778 df-ef 16159 df-cos 16162 df-tan 16163 |
| This theorem is used by: tancl 16223 tanval2 16227 retancl 16236 tanneg 16242 tan0 16245 retanhcl 16253 tanhlt1 16254 tanaddlem 16260 tanadd 16261 tanrpcl 26749 tangtx 26750 tan4thpi 26759 tan4thpiOLD 26760 tanord1 26782 atandmtan 27165 atantan 27168 basellem3 27327 basellem8 27332 tan2h 38374 tanhalfpim 43232 tan3rdpi 43235 reccot 50692 rectan 50693 onetansqsecsq 50695 dvsec 50697 |
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