$\left(\frac{x}{y}\right)^{\frac{1}{2}}\left(\frac{x}{y}\right)^{\frac{1}{2}}$

$\left(\frac{3}{4}t+\frac{1}{5}q\right)\left(\frac{3}{4}t-\frac{1}{5}q\right)$

$\lim_{x\to-3}\frac{x^2+x-6}{x+3}$

$\frac{2x^2-1}{x-2}$

$4\left(6x-6\right)+4\left(-2x+9\right)$

$a^{-2}b^{-2}\left(a^{-1}b^{-1}\right)^2$

$\lim\:_{x\to\:0}\left(\frac{3x}{\:\sqrt{2x-49}-7}\right)$