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posted by Veronica on Wednesday, January 6, 2010 at 2:23pm.

prove: 2sinx+sin2x = 2sin^3(x)/1-cosx

LS = 2sinx + 2sinxcosx = 2sinx(1 + cosx) = 2sinx(1 + cosx)(1-cosx)/(1-cosx) = 2sinx(1 - cos^2x)/(1-cosx) = 2sinx(sin^2x)/(1-cosx) = 2sin^3x/(1-cosx) = RS

Thank you Reiny!

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