$xydx+dy=0$
$\lim_{x\to-2}\left(\frac{x-3}{x^2-2x-3}\right)$
$\left|-7\right|+\left|-4\right|$
$26+2.7+59.5$
$\frac{\cot\left(a\right)}{\tan\left(a\right)}+1=\csc^2\left(a\right)$
$\frac{d}{dx}\left(cos^{-1}\left(x\right)\right)$
$25r^2-60rs+36s^2$
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