Worked Solution #3 of 5, increasing in difficulty.

Expand the following:

\begin{align} \quad\quad\quad\quad\quad\quad\quad\quad\Large \frac{x^2 \ y^4}{x^4 \ y^6}\\ \\ &\cssId{Step1}{\Large = { x^{2} \ y^{4} \ x^{-4} \ y^{-6}} }\\ \\ &\cssId{Step2}{\Large = { x^{2} \ x^{-4} \ y^{4} \ y^{-6}} }\\ \\ &\cssId{Step3}{\Large = { x^{2-4} \ y^{4-6}} }\\ \\ &\cssId{Step4}{\Large = { x^{-2} \ y^{-2} }}\\ \\ \end{align}