no clue how to start this: show sin 3x = 3 sin x - 4 sin^3 x
Sep 16, 2005 #1 thenewbosco 187 0 Main Question or Discussion Point no clue how to start this: show sin 3x = 3 sin x - 4 sin^3 x
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Sep 16, 2005 #3 thenewbosco 187 0 right so after doing this i get sin 3x = sin2x(cos x) + (cos2x)(sin x) whats next