$\left(-2n+3\right)\left(-2n-3\right)=4n^2$
$4^2+2^3-2^2-3^3$
$50\:+\:\left(24\right)+\left(6\right)-10$
$2-1-6-13-16$
$3\left(6\right)^2+30\left(6\right)+72$
$\frac{dy}{dx}=40-\frac{6y}{200-x}$
$\int x\:arc\:tan\:3x\:dx$
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