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

-sin(2*x)*(2*x)'

-sin(2*x)*((2)'*x+2*(x)')

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

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

2*(-sin(2*x))

-2*sin(2*x)

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