$\int\left(8+e^{-x}\right)^2e^{-x}dx$
$-15z\:=-225$
$\int\frac{1}{z\left(4+z^2\right)}dz$
$\:\frac{x}{2}=-16$
$12-2\cdot3$
$\frac{d}{dx}\left(\frac{x^2-x}{x}\right)$
$\lim_{x\to\infty}\left(x\:sin\left(\frac{5\pi}{x}\right)\right)$
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