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(cos(2*x)-cos(6*x))'The calculation above is a derivative of the function f (x)

(cos(2*x))'+(-cos(6*x))'

(-cos(6*x))'-sin(2*x)*(2*x)'

(-cos(6*x))'-sin(2*x)*((2)'*x+2*(x)')

(-cos(6*x))'-sin(2*x)*(0*x+2*(x)')

(-cos(6*x))'-sin(2*x)*(0*x+2*1)

2*(-sin(2*x))+(-cos(6*x))'

-2*sin(2*x)-sin(6*x)*(6*x)'

-2*sin(2*x)-sin(6*x)*((6)'*x+6*(x)')

-2*sin(2*x)-sin(6*x)*(0*x+6*(x)')

-2*sin(2*x)-sin(6*x)*(0*x+6*1)

6*(-sin(6*x))-2*sin(2*x)

6*sin(6*x)-(2*sin(2*x))

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