Find the derivative of f(x)=cos(x)+x2f(x) = \cos(x) + x^2f(x)=cos(x)+x2.
cos(x)+2x\cos(x) + 2xcos(x)+2x
sin(x)+2x\sin(x) + 2xsin(x)+2x
−sin(x)+2x-\sin(x) + 2x−sin(x)+2x
−sin(x)+x2-\sin(x) + x^2−sin(x)+x2