$\frac{a^3+1}{a^2-a+1}$
$\left(\sqrt{7x}+2\right)\left(\sqrt{7x}-2\right)$
$100-16x^2$
$pv-pb+av-ab$
$\left(x+2\right)\left(x+1\right)\ge0$
$\int\frac{3x}{x^2+2x+3}dx$
$\left(\sqrt{10x^3}\right)\left(\sqrt{2x}\right)$
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