$13m^2-12mn$
$9.38+57$
$\lim_{x\to2}\left(\frac{x-2}{x^{22}}\right)$
$-2x-16x+25$
$\tan^2x\sec^3x$
$\left(4\right)^3-2\left(4\right)^2+\left(-4\right)-9$
$\left(-7\right)\:\:\cdot\:\:19\:\:$
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