sin3x+sin2x-sinx=4sinx cosx/2 cos3x/2
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2cos2x.sinx+2sinxcosx
2sinx(cos2x+cosx)
2sinx.2cos3x/2.cosx/2. proved
2sinx(cos2x+cosx)
2sinx.2cos3x/2.cosx/2. proved
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