$\left(2x^{-2}y\right)\left(8x^{-3}y^{-3}\right)$
$\left(x+12\right)\left(x+8\right)$
$m^5-10m;\:m=3$
$\left(-200\right)-\left(-350\right)$
$\int\cot^2x\:dx$
$3n^2-11n-20$
$\left(3z^2+7\right)\left(3z^2-4\right)$
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