$\frac{4x^3-8}{x+5}$
$\left(a-5\right)\left(a-8\right)$
$195.36-1628\:$
$1.1^3$
$-15:-15$
$\frac{\cot\left(a\right)-\tan\left(a\right)}{1-tan\left(a\right)}$
$\lim_{x\to2}\left|-x^5+5x^3-20\right|$
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