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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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