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posted by sonu Monday, July 8, 2013 at 12:39pm.
Sin 3x=3 sin x-4 sin^3 x
sin 3x sin2x cosx + cos2x sinx 2sinx cosx cosx + (1 - 2sin^2 x)sinx 2sinx cos^2 x + sinx - 2sin^3 x 2sinx (1-sin^2 x) + sinx - 2sin^3 x 2sinx - 2sin^3 x + sinx - 2sin^3 x 3sinx - 4sin^3 x
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