$2x^2+4xy-8y^2$

$\lim_{x\to0}\left(\frac{\cos\left(x\right)}{1-sin\left(x\right)}\right)$

$5\:-\:\left[-\left(16\:-\:9\right)\:-\:\left(-17\:-\:13\right)\right]$

$\lim_{x\to\frac{\pi}{4}}\left(\frac{\cos\left(x\right)^2}{1-\sin\left(2x\right)}\right)$

$x^2+y^2-18x+12y+144=25$

$-\frac{4}{7}mn^{-3}+\frac{5}{3}mn^{-3}$

$\int_0^8\left(2\sqrt[3]{w}-3\right)dx$