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Mirrors > Home > MPE Home > Th. List > cossub | Structured version Visualization version GIF version |
Description: Cosine of difference. (Contributed by Paul Chapman, 12-Oct-2007.) |
Ref | Expression |
---|---|
cossub | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (cos‘(𝐴 − 𝐵)) = (((cos‘𝐴) · (cos‘𝐵)) + ((sin‘𝐴) · (sin‘𝐵)))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | negcl 10888 | . . 3 ⊢ (𝐵 ∈ ℂ → -𝐵 ∈ ℂ) | |
2 | cosadd 15520 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ -𝐵 ∈ ℂ) → (cos‘(𝐴 + -𝐵)) = (((cos‘𝐴) · (cos‘-𝐵)) − ((sin‘𝐴) · (sin‘-𝐵)))) | |
3 | 1, 2 | sylan2 594 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (cos‘(𝐴 + -𝐵)) = (((cos‘𝐴) · (cos‘-𝐵)) − ((sin‘𝐴) · (sin‘-𝐵)))) |
4 | negsub 10936 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 + -𝐵) = (𝐴 − 𝐵)) | |
5 | 4 | fveq2d 6676 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (cos‘(𝐴 + -𝐵)) = (cos‘(𝐴 − 𝐵))) |
6 | cosneg 15502 | . . . . . 6 ⊢ (𝐵 ∈ ℂ → (cos‘-𝐵) = (cos‘𝐵)) | |
7 | 6 | adantl 484 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (cos‘-𝐵) = (cos‘𝐵)) |
8 | 7 | oveq2d 7174 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((cos‘𝐴) · (cos‘-𝐵)) = ((cos‘𝐴) · (cos‘𝐵))) |
9 | sinneg 15501 | . . . . . . 7 ⊢ (𝐵 ∈ ℂ → (sin‘-𝐵) = -(sin‘𝐵)) | |
10 | 9 | adantl 484 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (sin‘-𝐵) = -(sin‘𝐵)) |
11 | 10 | oveq2d 7174 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((sin‘𝐴) · (sin‘-𝐵)) = ((sin‘𝐴) · -(sin‘𝐵))) |
12 | sincl 15481 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → (sin‘𝐴) ∈ ℂ) | |
13 | sincl 15481 | . . . . . 6 ⊢ (𝐵 ∈ ℂ → (sin‘𝐵) ∈ ℂ) | |
14 | mulneg2 11079 | . . . . . 6 ⊢ (((sin‘𝐴) ∈ ℂ ∧ (sin‘𝐵) ∈ ℂ) → ((sin‘𝐴) · -(sin‘𝐵)) = -((sin‘𝐴) · (sin‘𝐵))) | |
15 | 12, 13, 14 | syl2an 597 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((sin‘𝐴) · -(sin‘𝐵)) = -((sin‘𝐴) · (sin‘𝐵))) |
16 | 11, 15 | eqtrd 2858 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((sin‘𝐴) · (sin‘-𝐵)) = -((sin‘𝐴) · (sin‘𝐵))) |
17 | 8, 16 | oveq12d 7176 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (((cos‘𝐴) · (cos‘-𝐵)) − ((sin‘𝐴) · (sin‘-𝐵))) = (((cos‘𝐴) · (cos‘𝐵)) − -((sin‘𝐴) · (sin‘𝐵)))) |
18 | coscl 15482 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (cos‘𝐴) ∈ ℂ) | |
19 | coscl 15482 | . . . . 5 ⊢ (𝐵 ∈ ℂ → (cos‘𝐵) ∈ ℂ) | |
20 | mulcl 10623 | . . . . 5 ⊢ (((cos‘𝐴) ∈ ℂ ∧ (cos‘𝐵) ∈ ℂ) → ((cos‘𝐴) · (cos‘𝐵)) ∈ ℂ) | |
21 | 18, 19, 20 | syl2an 597 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((cos‘𝐴) · (cos‘𝐵)) ∈ ℂ) |
22 | mulcl 10623 | . . . . 5 ⊢ (((sin‘𝐴) ∈ ℂ ∧ (sin‘𝐵) ∈ ℂ) → ((sin‘𝐴) · (sin‘𝐵)) ∈ ℂ) | |
23 | 12, 13, 22 | syl2an 597 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((sin‘𝐴) · (sin‘𝐵)) ∈ ℂ) |
24 | 21, 23 | subnegd 11006 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (((cos‘𝐴) · (cos‘𝐵)) − -((sin‘𝐴) · (sin‘𝐵))) = (((cos‘𝐴) · (cos‘𝐵)) + ((sin‘𝐴) · (sin‘𝐵)))) |
25 | 17, 24 | eqtrd 2858 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (((cos‘𝐴) · (cos‘-𝐵)) − ((sin‘𝐴) · (sin‘-𝐵))) = (((cos‘𝐴) · (cos‘𝐵)) + ((sin‘𝐴) · (sin‘𝐵)))) |
26 | 3, 5, 25 | 3eqtr3d 2866 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (cos‘(𝐴 − 𝐵)) = (((cos‘𝐴) · (cos‘𝐵)) + ((sin‘𝐴) · (sin‘𝐵)))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ‘cfv 6357 (class class class)co 7158 ℂcc 10537 + caddc 10542 · cmul 10544 − cmin 10872 -cneg 10873 sincsin 15419 cosccos 15420 |
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 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-inf2 9106 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 ax-pre-sup 10617 ax-addf 10618 ax-mulf 10619 |
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 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-se 5517 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-isom 6366 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-1st 7691 df-2nd 7692 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-1o 8104 df-oadd 8108 df-er 8291 df-pm 8411 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-sup 8908 df-inf 8909 df-oi 8976 df-card 9370 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-nn 11641 df-2 11703 df-3 11704 df-n0 11901 df-z 11985 df-uz 12247 df-rp 12393 df-ico 12747 df-fz 12896 df-fzo 13037 df-fl 13165 df-seq 13373 df-exp 13433 df-fac 13637 df-bc 13666 df-hash 13694 df-shft 14428 df-cj 14460 df-re 14461 df-im 14462 df-sqrt 14596 df-abs 14597 df-limsup 14830 df-clim 14847 df-rlim 14848 df-sum 15045 df-ef 15423 df-sin 15425 df-cos 15426 |
This theorem is referenced by: sinmul 15527 cosmul 15528 addcos 15529 subcos 15530 cosmpi 25076 coshalfpim 25083 fourierdlem83 42481 |
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