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posted by Anon on Wednesday, September 4, 2013 at 9:05pm.
Find the derivative of y=sin(x)*(sinx+cosx)
just use the product rule If y = uv then y' = u'v + uv' where u=sinx and v=sinx+cosx y' = cosx(sinx+cosx) + sinx(cosx-sinx) = sin2x + cos2x
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