$\frac{44m^9n^9}{11mn^8}$
$4\left(2x^2-1\right)^2$
$\lim_{x\to-10}\left(\frac{x+10}{x^2+21x+110}\right)$
$\frac{2160}{72}$
$\left(cotx\left(sinx+cosx\right)\right)$
$\frac{d}{dx}x=2$
$2u^2-20u-4$
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