$\frac{d^2}{dx^2}\left(\frac{1}{2}\cdot\:\sin\:\left(\frac{x}{3}\right)\right)$

$\int\:\:x^2e^{-x}\:dx$

$\int\frac{u^2}{\sqrt{1-u^2}}du$

$\lim_{x\to\infty}\left(\frac{\sqrt{x^2+1}-\sqrt{x^2-1}}{x}\right)$

$\left(10x\right)\left(-10x\right)^{-1}$

$-6\left(1-y\right)=36-y$

$\frac{-24x}{x^2}$