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(sin(4*x)*cos(4*x))'The calculation above is a derivative of the function f (x)

(sin(4*x))'*cos(4*x)+sin(4*x)*(cos(4*x))'

cos(4*x)*(4*x)'*cos(4*x)+sin(4*x)*(cos(4*x))'

cos(4*x)*((4)'*x+4*(x)')*cos(4*x)+sin(4*x)*(cos(4*x))'

cos(4*x)*(0*x+4*(x)')*cos(4*x)+sin(4*x)*(cos(4*x))'

cos(4*x)*(0*x+4*1)*cos(4*x)+sin(4*x)*(cos(4*x))'

4*cos(4*x)*cos(4*x)+sin(4*x)*(cos(4*x))'

4*cos(4*x)*cos(4*x)+sin(4*x)*-sin(4*x)*(4*x)'

4*cos(4*x)*cos(4*x)+sin(4*x)*-sin(4*x)*((4)'*x+4*(x)')

4*cos(4*x)*cos(4*x)+sin(4*x)*-sin(4*x)*(0*x+4*(x)')

4*cos(4*x)*cos(4*x)+sin(4*x)*-sin(4*x)*(0*x+4*1)

4*cos(4*x)*cos(4*x)+sin(4*x)*4*(-sin(4*x))

4*cos(4*x)*cos(4*x)+sin(4*x)*-4*sin(4*x)

4*(cos(4*x))^2-(4*(sin(4*x))^2)

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