Find the second derivative of f(x)=cos(2x)f(x) = \cos(2x)f(x)=cos(2x).
−4cos(2x)-4 \cos(2x)−4cos(2x)
−2cos(2x)-2 \cos(2x)−2cos(2x)
4cos(2x)4 \cos(2x)4cos(2x)
−4sin(2x)-4 \sin(2x)−4sin(2x)