$\lim_{x\to-2}\left(\frac{5x^4-3x^2-68}{2x^5-3x^2-2x+8}\right)$

$\int_0^b\left(\frac{1}{\sqrt{x^2+b^2}}\right)dx$

$\int\frac{\left(x+1\right)}{\left(x^2-4x+7\right)^2}dx$

$x^2+7x+7$

$\frac{4x+2\le x\:}{6x-5<x+1}$

$\sqrt[.]{\left|36\right|}$

$\lim_{x\to0}\left(\frac{x^4}{\sqrt{x^4+16}-4}\right)$