m1egu3eroryanialmoni m1egu3eroryanialmoni
  • 26-11-2016
  • Mathematics
contestada

sin8x=8sinxcosxcos2xcos4x
proving trig identity?

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HomertheGenius
HomertheGenius HomertheGenius
  • 02-12-2016
sin 8 x = 2 sin 4x  cos 4x =
= 2 * 2  sin 2x  cos 2x  cos 4 x =
= 4 * 2  sin x  cos x  cos 2x  cos 4x =
= 8  sin x  cos x  cos 2x  cos 4x    ( correct )  
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