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inessss [21]
3 years ago
7

Sin8x=8sinxcosxcos2xcos4x proving trig identity?

Mathematics
1 answer:
weeeeeb [17]3 years ago
7 0
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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