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Mirrors > Home > MPE Home > Th. List > sin2t | Structured version Visualization version GIF version |
Description: Double-angle formula for sine. (Contributed by Paul Chapman, 17-Jan-2008.) |
Ref | Expression |
---|---|
sin2t | β’ (π΄ β β β (sinβ(2 Β· π΄)) = (2 Β· ((sinβπ΄) Β· (cosβπ΄)))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2times 12294 | . . 3 β’ (π΄ β β β (2 Β· π΄) = (π΄ + π΄)) | |
2 | 1 | fveq2d 6847 | . 2 β’ (π΄ β β β (sinβ(2 Β· π΄)) = (sinβ(π΄ + π΄))) |
3 | coscl 16014 | . . . . 5 β’ (π΄ β β β (cosβπ΄) β β) | |
4 | sincl 16013 | . . . . 5 β’ (π΄ β β β (sinβπ΄) β β) | |
5 | 3, 4 | mulcomd 11181 | . . . 4 β’ (π΄ β β β ((cosβπ΄) Β· (sinβπ΄)) = ((sinβπ΄) Β· (cosβπ΄))) |
6 | 5 | oveq2d 7374 | . . 3 β’ (π΄ β β β (((sinβπ΄) Β· (cosβπ΄)) + ((cosβπ΄) Β· (sinβπ΄))) = (((sinβπ΄) Β· (cosβπ΄)) + ((sinβπ΄) Β· (cosβπ΄)))) |
7 | sinadd 16051 | . . . 4 β’ ((π΄ β β β§ π΄ β β) β (sinβ(π΄ + π΄)) = (((sinβπ΄) Β· (cosβπ΄)) + ((cosβπ΄) Β· (sinβπ΄)))) | |
8 | 7 | anidms 568 | . . 3 β’ (π΄ β β β (sinβ(π΄ + π΄)) = (((sinβπ΄) Β· (cosβπ΄)) + ((cosβπ΄) Β· (sinβπ΄)))) |
9 | 4, 3 | mulcld 11180 | . . . 4 β’ (π΄ β β β ((sinβπ΄) Β· (cosβπ΄)) β β) |
10 | 9 | 2timesd 12401 | . . 3 β’ (π΄ β β β (2 Β· ((sinβπ΄) Β· (cosβπ΄))) = (((sinβπ΄) Β· (cosβπ΄)) + ((sinβπ΄) Β· (cosβπ΄)))) |
11 | 6, 8, 10 | 3eqtr4d 2783 | . 2 β’ (π΄ β β β (sinβ(π΄ + π΄)) = (2 Β· ((sinβπ΄) Β· (cosβπ΄)))) |
12 | 2, 11 | eqtrd 2773 | 1 β’ (π΄ β β β (sinβ(2 Β· π΄)) = (2 Β· ((sinβπ΄) Β· (cosβπ΄)))) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 = wceq 1542 β wcel 2107 βcfv 6497 (class class class)co 7358 βcc 11054 + caddc 11059 Β· cmul 11061 2c2 12213 sincsin 15951 cosccos 15952 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5243 ax-sep 5257 ax-nul 5264 ax-pow 5321 ax-pr 5385 ax-un 7673 ax-inf2 9582 ax-cnex 11112 ax-resscn 11113 ax-1cn 11114 ax-icn 11115 ax-addcl 11116 ax-addrcl 11117 ax-mulcl 11118 ax-mulrcl 11119 ax-mulcom 11120 ax-addass 11121 ax-mulass 11122 ax-distr 11123 ax-i2m1 11124 ax-1ne0 11125 ax-1rid 11126 ax-rnegex 11127 ax-rrecex 11128 ax-cnre 11129 ax-pre-lttri 11130 ax-pre-lttrn 11131 ax-pre-ltadd 11132 ax-pre-mulgt0 11133 ax-pre-sup 11134 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3352 df-reu 3353 df-rab 3407 df-v 3446 df-sbc 3741 df-csb 3857 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3930 df-nul 4284 df-if 4488 df-pw 4563 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4867 df-int 4909 df-iun 4957 df-br 5107 df-opab 5169 df-mpt 5190 df-tr 5224 df-id 5532 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5589 df-se 5590 df-we 5591 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-pred 6254 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6499 df-fn 6500 df-f 6501 df-f1 6502 df-fo 6503 df-f1o 6504 df-fv 6505 df-isom 6506 df-riota 7314 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7804 df-1st 7922 df-2nd 7923 df-frecs 8213 df-wrecs 8244 df-recs 8318 df-rdg 8357 df-1o 8413 df-er 8651 df-pm 8771 df-en 8887 df-dom 8888 df-sdom 8889 df-fin 8890 df-sup 9383 df-inf 9384 df-oi 9451 df-card 9880 df-pnf 11196 df-mnf 11197 df-xr 11198 df-ltxr 11199 df-le 11200 df-sub 11392 df-neg 11393 df-div 11818 df-nn 12159 df-2 12221 df-3 12222 df-n0 12419 df-z 12505 df-uz 12769 df-rp 12921 df-ico 13276 df-fz 13431 df-fzo 13574 df-fl 13703 df-seq 13913 df-exp 13974 df-fac 14180 df-bc 14209 df-hash 14237 df-shft 14958 df-cj 14990 df-re 14991 df-im 14992 df-sqrt 15126 df-abs 15127 df-limsup 15359 df-clim 15376 df-rlim 15377 df-sum 15577 df-ef 15955 df-sin 15957 df-cos 15958 |
This theorem is referenced by: sin02gt0 16079 sin4lt0 16082 pilem2 25827 sinhalfpilem 25836 sin2pi 25848 tangtx 25878 sinq12gt0 25880 sincos4thpi 25886 sincos6thpi 25888 dirkertrigeqlem2 44426 |
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