$a^3b^3+a^2b^4$
$3x^2-x-15$
$5r\:-2\:r\:-3$
$\int\frac{1}{\sqrt{9-4s^2}}dx$
$\frac{x-2}{x^3-2x^2+2x-4}$
$id-\left(-2\right)$
$\frac{x^2-3x+2}{x^2-2}$
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