$\frac{5}{2x-2}=\frac{15}{x^2-1}$
$\int\left(\frac{-x^2}{x-1}\right)dx$
$\lim_{x\to\pi}\left(\frac{\cos\left(x\right)+1}{x-\pi}\right)$
$\cos\left(1.159\right)$
$\left(x^2y+y\right)\frac{dy}{dx}=x$
$49n^2-70nf+25f^2$
$-3n\:-\:5n\:-\:\left(-8n\right)$
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