m1egu3eroryanialmoni m1egu3eroryanialmoni

26-11-2016
Mathematics

Answered

sin8x=8sinxcosxcos2xcos4x

proving trig identity?

Verified Answer :

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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