differentiate sin2x in different methods
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d/dx(Sin2x) =2 cos2x(function of functions)
Or we can say
d/dx(2sinxcosx)........(as sin2x=2sinxcosx)
Now by using product rule we can differentiate it
2( sinx d/dxcosx+ d/dx sinx (cosx))
2( - sin^2 x +cos^2 x)
=2 cos2x.....(- sin^2 x +cos^2 x)=cos2x
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