$2\cdot\left|3\cdot\left(-9+4\left(5\cdot3-9\right)\right)-3\cdot\left(40-8\right)\right|$
$x^2+27x+50$
$7\left(1+6x\right)$
$\lim_{x\to1}\left(\frac{\left(x+3\right)\left(x-1\right)}{x^2-1}\right)$
$x^2+2\cdot x-3>0$
$8a^3-6^2$
$\int in\sqrt{x^2-1}dx$
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