$\:271\:-\:\left(-312\right)$
$\left(2x-2y-2z\right)\left(2x+y+z\right)$
$\left(l^3o^4v^5-6e^3\right)\left(l^3o^4v^5+6e^3\right)$
$\frac{dy}{dx}=\frac{1}{4}xy=\frac{1}{4}$
$\left(75\right)\left(85\right)$
$6y^2+30y+24$
$\int\frac{1}{1+2x+x^2}dx$
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