$\lim_{x\to1}\left(\frac{x^2\:-1}{x^2\:-1}\right)$

$\frac{dy}{dx}\:-\:\frac{2y}{x}\:=\:x^2\:sin\:3x$

$\int_5^{\infty}\left(\frac{1}{\sqrt{x^2-25}}\right)dx$

$\left(\frac{1}{3}a+\frac{1}{4}b\right)^2$

$36-12m^2+m^4$

$\frac{d}{dx}\left(xy+arctan\left(\frac{x}{y}\right)\right)$

$-47.61+202.27+300$