$\int\:\frac{sec\left(u\right)}{tan\left(u\right)}du$

$2\left\{3\:4\right\}+5\left\{6-3\right\}$

$1+-3+-5+7$

$\lim_{x\to0}\left(\frac{e^{2x}-1}{sin\left(x\right)\cdot e^x}\right)$

$\int_0^{\infty}\left(\frac{x^2}{\sqrt{2+x^3}}\right)dx$

$\left(x-y-z\right)^3$

$\frac{-216.35\pi}{180}$