$\frac{x+2}{x^2+5x+6}$
$\left(\sqrt{3}+y\right)\left(\sqrt{3}-y\right)$
$\frac{a^4y^0}{x^{-2}}$
$15x^2-44x+21$
$\lim_{x\to\infty}\:\left(\sqrt{x^2+7x}-x\right)$
$-10p+-4p-7+8y$
$a\:x\:6^2$
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