I'm working through a chapter on differentiation and I don't understand how they've rewrote a certain expression:

$\displaystyle \lim_{x \to 0}\frac{\sqrt[3]{x} - \sqrt[3]{0}}{x - 0} = \lim_{x \to 0}\frac{1}{\sqrt[3]{x^2}}$. I need some step by step help on how they rewrote the left hand part to the right hand part...