$\int\frac{\sqrt{x^2-4\:}}{x^2}dx$
$a\:2\:-\:9\:=\:\left(a\:+\:3\right)\left(a\:-3\right)$
$y'+2ty=t$
$\int x\sin\cdot\left(\pi-\frac{x}{2}\right)dx$
$\frac{a^{22}}{\left(a^3\right)^8}$
$\left(\sqrt{7}xy-\sqrt{3}w\right)\left(\sqrt{7}xy+\sqrt{3}w\right)$
$\left(15-12\cdot\:\left(30+4\cdot\:\left(-3\right)-5\right)-20\right)\cdot\:\left(-2\right)+70$
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