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  • Prove:- Sin3x+sin2x-sinx=4sinx cosx/2 cos3x/2

Prove:- Sin3x+sin2x-sinx=4sinx cosx/2 cos3x/2

Answers (1)

LHS=(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

Posted by

shubham.krishnan

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