$7\sqrt{8}-9\sqrt{50}$
$\frac{27x^3+8}{3x-2}$
$t^2\:u^2\:\:t^4\:$
$\left(-1\right)\cdot\left(-2\right)\cdot\left(-3\right)\cdot\left(-7\right)$
$\frac{d}{dx}\left(\frac{4x^2-9}{x^2-16}\right)$
$3x-2<x$
$\lim_{x\to-2.001}\left(\frac{x^2-4}{x+2}\right)$
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