Derivative of -cos(x)+4cos(2x)

Derivative of -cos(x)+4cos(2x). Simple step by step solution, to learn. Simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

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Derivative of -cos(x)+4cos(2x): 


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

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

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

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

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

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

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

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

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

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

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

sin(x)-(8*sin(2*x))

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

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