$\frac{6^{6}\cdot8^{6}}{48^{6}}$

$\left(25xy\right)^{-\frac{1}{2}}$

$\lim_{x\to0}\left(\frac{a^x-2\cdot\:\:cos\left(x\right)+a^{-x}}{xsin\left(x\right)}\right)$

$\left(9+x^{12}\right)\cdot\frac{dy}{dx}=\left(\frac{x^{11}}{y}\right)$

$\lim_{x\to-5}\frac{y^2}{5-y}$

$\int\left(4+x^2\right)^2dx$

$\lim_{x\to-3}\left(\frac{x^{2}-9}{-6x+18}\right)$