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Sin8x=8sinxcosxcos2xcos4x proving trig identity?
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Sin8x=8sinxcosxcos2xcos4x
proving trig identity?

User Ben Rubin
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1 Answer

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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 )
User Ernestine
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