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How do you find the derivative of ## cos^2(2x)##?...
How do you find the derivative of ## cos^2(2x)##?
##y=cos^2(2x)## ##dy/dx=2cos(2x)*-sin(2x)*2## ##dy/dx=-4cos(2x)*sin(2x)## ##dy/dx=-2sin(4x)##
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