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(4*cos(2*x))'The calculation above is a derivative of the function f (x)

(4)'*cos(2*x)+4*(cos(2*x))'

0*cos(2*x)+4*(cos(2*x))'

0*cos(2*x)+4*-sin(2*x)*(2*x)'

0*cos(2*x)+4*-sin(2*x)*((2)'*x+2*(x)')

0*cos(2*x)+4*-sin(2*x)*(0*x+2*(x)')

0*cos(2*x)+4*-sin(2*x)*(0*x+2*1)

0*cos(2*x)+4*2*(-sin(2*x))

0*cos(2*x)+4*-2*sin(2*x)

-8*sin(2*x)

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