Posted by Hello on Friday, March 11, 2011 at 10:32am.
to ways to do it
1. recognize that 2sinxcosx = sin(2x)
then dy/dx = 2cos(2x)
or
2. y = 2sinxcosx
dy/dx = 2sinx(-sinx) + 2cosx(cosx)
= 2(cos^2x - sin^2x)
which just happens to be 2cos(2x) as above
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