$\int\frac{e^x}{x^2}dx$

$\tan\left(x\right)\sec^4\left(x\right)$

$x^5-4x^4-10x^3+40x+9x-36$

$\lim_{x\to4}\left(\frac{x^2-16}{\left|x\right|-4}\right)$

$2x-45>-2x-5$

$\frac{tg^2\left(x\right)+1}{tg^2\left(x\right)}$

$732+\left(-485\right)$