$\frac{2x-2}{x-1}$
$|20|\:-\:12$
$s-21\le-18$
$\lim_{x\to\infty}\left(\frac{5x^2}{e^{6x}}\right)$
$sen^2\left(nx\right)$
$\frac{dy}{dx}x\left(1+y\right)$
$x^2y''\left(x\right)\:+\:2xy'\left(x\right)\:-\:2y\left(x\right)\:=\:6x$
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