$8cot^2x+12cot\:x-8$
$c^2+5c-2c$
$2\left(-13\right)+1$
$\left(3m-n^2\right)^2$
$125x^6y^3+27x^3y^9$
$4x^2\:+\:48y\:+\:12x\:-\:159\:=\:0\:$
$\frac{dy}{dx}=-\frac{\left(y^2+y\right)}{x}$
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