Asked by urgent
prove that
sin8x = 8sinx cosx cos2x cos4x
sin8x = 8sinx cosx cos2x cos4x
Answers
Answered by
oobleck
sin8x = 2 sin4x cos4x
sin4x = 2 sin2x cos2x
and so on
sin4x = 2 sin2x cos2x
and so on
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