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

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

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

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

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

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

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

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

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

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