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Mirrors > Home > ILE Home > Th. List > sinmul | Unicode version |
Description: Product of sines can be rewritten as half the difference of certain cosines. This follows from cosadd 11433 and cossub 11437. (Contributed by David A. Wheeler, 26-May-2015.) |
Ref | Expression |
---|---|
sinmul |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cossub 11437 | . . . . 5 | |
2 | cosadd 11433 | . . . . 5 | |
3 | 1, 2 | oveq12d 5785 | . . . 4 |
4 | coscl 11403 | . . . . . 6 | |
5 | coscl 11403 | . . . . . 6 | |
6 | mulcl 7740 | . . . . . 6 | |
7 | 4, 5, 6 | syl2an 287 | . . . . 5 |
8 | sincl 11402 | . . . . . 6 | |
9 | sincl 11402 | . . . . . 6 | |
10 | mulcl 7740 | . . . . . 6 | |
11 | 8, 9, 10 | syl2an 287 | . . . . 5 |
12 | pnncan 7996 | . . . . . . 7 | |
13 | 12 | 3anidm23 1275 | . . . . . 6 |
14 | 2times 8841 | . . . . . . 7 | |
15 | 14 | adantl 275 | . . . . . 6 |
16 | 13, 15 | eqtr4d 2173 | . . . . 5 |
17 | 7, 11, 16 | syl2anc 408 | . . . 4 |
18 | 2cn 8784 | . . . . 5 | |
19 | mulcom 7742 | . . . . 5 | |
20 | 18, 11, 19 | sylancr 410 | . . . 4 |
21 | 3, 17, 20 | 3eqtrd 2174 | . . 3 |
22 | 21 | oveq1d 5782 | . 2 |
23 | 2ap0 8806 | . . . 4 # | |
24 | divcanap4 8452 | . . . 4 # | |
25 | 18, 23, 24 | mp3an23 1307 | . . 3 |
26 | 11, 25 | syl 14 | . 2 |
27 | 22, 26 | eqtr2d 2171 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1331 wcel 1480 class class class wbr 3924 cfv 5118 (class class class)co 5767 cc 7611 cc0 7613 caddc 7616 cmul 7618 cmin 7926 # cap 8336 cdiv 8425 c2 8764 csin 11339 ccos 11340 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-coll 4038 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-iinf 4497 ax-cnex 7704 ax-resscn 7705 ax-1cn 7706 ax-1re 7707 ax-icn 7708 ax-addcl 7709 ax-addrcl 7710 ax-mulcl 7711 ax-mulrcl 7712 ax-addcom 7713 ax-mulcom 7714 ax-addass 7715 ax-mulass 7716 ax-distr 7717 ax-i2m1 7718 ax-0lt1 7719 ax-1rid 7720 ax-0id 7721 ax-rnegex 7722 ax-precex 7723 ax-cnre 7724 ax-pre-ltirr 7725 ax-pre-ltwlin 7726 ax-pre-lttrn 7727 ax-pre-apti 7728 ax-pre-ltadd 7729 ax-pre-mulgt0 7730 ax-pre-mulext 7731 ax-arch 7732 ax-caucvg 7733 |
This theorem depends on definitions: df-bi 116 df-dc 820 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-nel 2402 df-ral 2419 df-rex 2420 df-reu 2421 df-rmo 2422 df-rab 2423 df-v 2683 df-sbc 2905 df-csb 2999 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-if 3470 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-iun 3810 df-disj 3902 df-br 3925 df-opab 3985 df-mpt 3986 df-tr 4022 df-id 4210 df-po 4213 df-iso 4214 df-iord 4283 df-on 4285 df-ilim 4286 df-suc 4288 df-iom 4500 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-res 4546 df-ima 4547 df-iota 5083 df-fun 5120 df-fn 5121 df-f 5122 df-f1 5123 df-fo 5124 df-f1o 5125 df-fv 5126 df-isom 5127 df-riota 5723 df-ov 5770 df-oprab 5771 df-mpo 5772 df-1st 6031 df-2nd 6032 df-recs 6195 df-irdg 6260 df-frec 6281 df-1o 6306 df-oadd 6310 df-er 6422 df-en 6628 df-dom 6629 df-fin 6630 df-sup 6864 df-pnf 7795 df-mnf 7796 df-xr 7797 df-ltxr 7798 df-le 7799 df-sub 7928 df-neg 7929 df-reap 8330 df-ap 8337 df-div 8426 df-inn 8714 df-2 8772 df-3 8773 df-4 8774 df-n0 8971 df-z 9048 df-uz 9320 df-q 9405 df-rp 9435 df-ico 9670 df-fz 9784 df-fzo 9913 df-seqfrec 10212 df-exp 10286 df-fac 10465 df-bc 10487 df-ihash 10515 df-cj 10607 df-re 10608 df-im 10609 df-rsqrt 10763 df-abs 10764 df-clim 11041 df-sumdc 11116 df-ef 11343 df-sin 11345 df-cos 11346 |
This theorem is referenced by: ptolemy 12894 |
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