Sin3x+sin2x-sinx=4sinx cosx/2 cos3x/2?
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(Sin 3x - Sin x) + Sin 2 x
= 2 Sin x Cos 2x + 2 Sin x Cos x
= 2 Sin x [ Cos 2x + Cos x ]
= 2 Sin x * 2 Cos 3x/2 Cos x/2
=RHS
= 2 Sin x Cos 2x + 2 Sin x Cos x
= 2 Sin x [ Cos 2x + Cos x ]
= 2 Sin x * 2 Cos 3x/2 Cos x/2
=RHS
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