Prove that sin3x + sin 2x – sinx = 4 sinx cos x/2 cos3x/2

Hi Vinit,

Here is the answer to your question.

All the Best!

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= (sin3x - sinx)+sin2x= 2cos2x sinx +sin2x =2cos2x sinx +2sinx cosx=2sinx( cos2x +cosx)= 2sinx(2cos3x/2 cosx/2 )=ans

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