$a^{2}-2at$
$\lim_{x\to0}\left(\frac{x^3+x^2-24x+36}{x^2-2x-3}\right)$
$\left(3\right)^2-\left(3\right)-6$
$\int-\frac{x}{4\sqrt{x^2-4}}dx$
$\frac{4x^2-634}{2x-8}$
$x^2\:-\:x\:-\:7\:=\:0$
$\frac{dy}{dt}+ty-y=0$
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