$6+3-2x-9$
$-\left(-2+3\right)^2$
$\int\frac{9x+7}{6x^2-13x-5}dx$
$am^2-an^2-a^2m$
$\ln\left(\sqrt{a^2-4}\right)$
$\frac{x^3-4x+1}{x\:-\:3}$
$\int\frac{t^3+1}{t+1}dt$
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