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| Mirrors > Home > MPE Home > Th. List > sincossq | Structured version Visualization version GIF version | ||
| Description: Sine squared plus cosine squared is 1. Equation 17 of [Gleason] p. 311. Note that this holds for non-real arguments, even though individually each term is unbounded. (Contributed by NM, 15-Jan-2006.) |
| Ref | Expression |
|---|---|
| sincossq | ⊢ (𝐴 ∈ ℂ → (((sin‘𝐴)↑2) + ((cos‘𝐴)↑2)) = 1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | negcl 11457 | . . 3 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ) | |
| 2 | cosadd 16221 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ -𝐴 ∈ ℂ) → (cos‘(𝐴 + -𝐴)) = (((cos‘𝐴) · (cos‘-𝐴)) − ((sin‘𝐴) · (sin‘-𝐴)))) | |
| 3 | 1, 2 | mpdan 699 | . 2 ⊢ (𝐴 ∈ ℂ → (cos‘(𝐴 + -𝐴)) = (((cos‘𝐴) · (cos‘-𝐴)) − ((sin‘𝐴) · (sin‘-𝐴)))) |
| 4 | negid 11505 | . . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 + -𝐴) = 0) | |
| 5 | 4 | fveq2d 6886 | . . 3 ⊢ (𝐴 ∈ ℂ → (cos‘(𝐴 + -𝐴)) = (cos‘0)) |
| 6 | cos0 16206 | . . 3 ⊢ (cos‘0) = 1 | |
| 7 | 5, 6 | eqtrdi 2820 | . 2 ⊢ (𝐴 ∈ ℂ → (cos‘(𝐴 + -𝐴)) = 1) |
| 8 | sincl 16182 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (sin‘𝐴) ∈ ℂ) | |
| 9 | 8 | sqcld 14180 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴)↑2) ∈ ℂ) |
| 10 | coscl 16183 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (cos‘𝐴) ∈ ℂ) | |
| 11 | 10 | sqcld 14180 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((cos‘𝐴)↑2) ∈ ℂ) |
| 12 | 9, 11 | addcomd 11412 | . . 3 ⊢ (𝐴 ∈ ℂ → (((sin‘𝐴)↑2) + ((cos‘𝐴)↑2)) = (((cos‘𝐴)↑2) + ((sin‘𝐴)↑2))) |
| 13 | 10 | sqvald 14179 | . . . . 5 ⊢ (𝐴 ∈ ℂ → ((cos‘𝐴)↑2) = ((cos‘𝐴) · (cos‘𝐴))) |
| 14 | cosneg 16203 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → (cos‘-𝐴) = (cos‘𝐴)) | |
| 15 | 14 | oveq2d 7427 | . . . . 5 ⊢ (𝐴 ∈ ℂ → ((cos‘𝐴) · (cos‘-𝐴)) = ((cos‘𝐴) · (cos‘𝐴))) |
| 16 | 13, 15 | eqtr4d 2807 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((cos‘𝐴)↑2) = ((cos‘𝐴) · (cos‘-𝐴))) |
| 17 | 8 | sqvald 14179 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴)↑2) = ((sin‘𝐴) · (sin‘𝐴))) |
| 18 | sinneg 16202 | . . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → (sin‘-𝐴) = -(sin‘𝐴)) | |
| 19 | 18 | negeqd 11451 | . . . . . . . 8 ⊢ (𝐴 ∈ ℂ → -(sin‘-𝐴) = --(sin‘𝐴)) |
| 20 | 8 | negnegd 11560 | . . . . . . . 8 ⊢ (𝐴 ∈ ℂ → --(sin‘𝐴) = (sin‘𝐴)) |
| 21 | 19, 20 | eqtrd 2804 | . . . . . . 7 ⊢ (𝐴 ∈ ℂ → -(sin‘-𝐴) = (sin‘𝐴)) |
| 22 | 21 | oveq2d 7427 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) · -(sin‘-𝐴)) = ((sin‘𝐴) · (sin‘𝐴))) |
| 23 | 17, 22 | eqtr4d 2807 | . . . . 5 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴)↑2) = ((sin‘𝐴) · -(sin‘-𝐴))) |
| 24 | 1 | sincld 16186 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → (sin‘-𝐴) ∈ ℂ) |
| 25 | 8, 24 | mulneg2d 11668 | . . . . 5 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) · -(sin‘-𝐴)) = -((sin‘𝐴) · (sin‘-𝐴))) |
| 26 | 23, 25 | eqtrd 2804 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴)↑2) = -((sin‘𝐴) · (sin‘-𝐴))) |
| 27 | 16, 26 | oveq12d 7429 | . . 3 ⊢ (𝐴 ∈ ℂ → (((cos‘𝐴)↑2) + ((sin‘𝐴)↑2)) = (((cos‘𝐴) · (cos‘-𝐴)) + -((sin‘𝐴) · (sin‘-𝐴)))) |
| 28 | 1 | coscld 16187 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (cos‘-𝐴) ∈ ℂ) |
| 29 | 10, 28 | mulcld 11229 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((cos‘𝐴) · (cos‘-𝐴)) ∈ ℂ) |
| 30 | 8, 24 | mulcld 11229 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((sin‘𝐴) · (sin‘-𝐴)) ∈ ℂ) |
| 31 | 29, 30 | negsubd 11575 | . . 3 ⊢ (𝐴 ∈ ℂ → (((cos‘𝐴) · (cos‘-𝐴)) + -((sin‘𝐴) · (sin‘-𝐴))) = (((cos‘𝐴) · (cos‘-𝐴)) − ((sin‘𝐴) · (sin‘-𝐴)))) |
| 32 | 12, 27, 31 | 3eqtrrd 2809 | . 2 ⊢ (𝐴 ∈ ℂ → (((cos‘𝐴) · (cos‘-𝐴)) − ((sin‘𝐴) · (sin‘-𝐴))) = (((sin‘𝐴)↑2) + ((cos‘𝐴)↑2))) |
| 33 | 3, 7, 32 | 3eqtr3rd 2813 | 1 ⊢ (𝐴 ∈ ℂ → (((sin‘𝐴)↑2) + ((cos‘𝐴)↑2)) = 1) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1567 ∈ wcel 2149 ‘cfv 6537 (class class class)co 7411 ℂcc 11098 0cc0 11100 1c1 11101 + caddc 11103 · cmul 11105 − cmin 11441 -cneg 11442 2c2 12295 ↑cexp 14097 sincsin 16117 cosccos 16118 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 ax-inf2 9610 ax-cnex 11156 ax-resscn 11157 ax-1cn 11158 ax-icn 11159 ax-addcl 11160 ax-addrcl 11161 ax-mulcl 11162 ax-mulrcl 11163 ax-mulcom 11164 ax-addass 11165 ax-mulass 11166 ax-distr 11167 ax-i2m1 11168 ax-1ne0 11169 ax-1rid 11170 ax-rnegex 11171 ax-rrecex 11172 ax-cnre 11173 ax-pre-lttri 11174 ax-pre-lttrn 11175 ax-pre-ltadd 11176 ax-pre-mulgt0 11177 ax-pre-sup 11178 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3375 df-reu 3376 df-rab 3423 df-v 3463 df-sbc 3752 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4491 df-pw 4567 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-int 4915 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5557 df-eprel 5562 df-po 5570 df-so 5571 df-fr 5615 df-se 5616 df-we 5617 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 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 7368 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7863 df-1st 7986 df-2nd 7987 df-frecs 8278 df-wrecs 8309 df-recs 8358 df-rdg 8397 df-1o 8453 df-er 8694 df-pm 8827 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-sup 9402 df-inf 9403 df-oi 9472 df-card 9925 df-pnf 11245 df-mnf 11246 df-xr 11247 df-ltxr 11248 df-le 11249 df-sub 11443 df-neg 11444 df-div 11872 df-nn 12234 df-2 12303 df-3 12304 df-n0 12505 df-z 12592 df-uz 12863 df-rp 13017 df-ico 13378 df-fz 13536 df-fzo 13683 df-fl 13825 df-seq 14038 df-exp 14098 df-fac 14310 df-bc 14339 df-hash 14367 df-shft 15104 df-cj 15150 df-re 15151 df-im 15152 df-sqrt 15286 df-abs 15287 df-limsup 15522 df-clim 15539 df-rlim 15540 df-sum 15738 df-ef 16121 df-sin 16123 df-cos 16124 |
| This theorem is referenced by: cos2t 16234 cos2tsin 16235 sinbnd 16236 cosbnd 16237 absefi 16252 sinhalfpilem 26594 sincos6thpi 26647 efif1olem4 26676 heron 26969 asinsin 27023 atandmtan 27051 basellem8 27218 sin2h 38184 tan2h 38186 dvtan 38244 itgsinexp 46596 sin3t 47532 cos3t 47533 sin5t 47539 onetansqsecsq 50459 cotsqcscsq 50460 |
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