What is the derivative of f(x)=1x3f(x) = \frac{1}{x^3}f(x)=x31?
−3x−4-3x^{-4}−3x−4
−3x−2-3x^{-2}−3x−2
3x−43x^{-4}3x−4
x−3x^{-3}x−3