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Question

Prove:
sin3x+sin2xsinx=4sinxcosx2cos3x2

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Solution

sin3x+sin2xsinx
=sin3x+2cos3x2sinx2
=2sin3x2cos3x2+2cos3x2sinx2
=2cos3x2(sin3x2+sinx2)
=(2cos3x2)(2sinxcosx2)
=4sinxcosx2cos3x2
Here proved

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