Derivative of cos(x)-2x

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Derivative of cos(x)-2x: 


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

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

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

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

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

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

-(sin(x)+2)

The calculation above is a derivative of the function f (x)

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