$\cot^3x\tan x=\csc x-1$
$\left(x-2\left(x+2\right)\right)$
$\frac{880}{4}$
$\left(5x\:+\:10y\right)^3$
$500\:.\:-8$
$9y\frac{dy}{dx}=-4x$
$ax-x^2$
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