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9 December, 13:52

Sin8x=8sinxcosxcos2xcos4x

proving trig identity?

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Answers (1)
  1. 9 December, 15:07
    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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