$\frac{1+x}{1-x}\geq1$
$\left(\frac{x}{2}+1\right)\left(\frac{x}{2}-1\right)$
$\left(\frac{1}{2}n+6\right)+\left(\frac{1}{4}n-\frac{1}{2}\right)$
$x^2+x+8$
$\frac{d}{dx}\sqrt[3]{4+7x^2}$
$-546-713$
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