$\frac{x^{-1}}{x^2}$
$\sqrt{3\left(\sqrt{3}-1\right)\left(\sqrt{3}+1\right)}$
$2\sqrt{7y}$
$-\left|8\right|\le\left|-8\right|$
$\left(-2+\frac{5}{8}x\right)^2$
$\frac{x^2+x}{\sqrt{x^2-1}}$
$-\left(2-5\right)+\left(-3\right)\left(-2+3\right)$
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