$\frac{3x^2y+15}{x^2-25\:}$
$\int\frac{x+2}{x\left(x^2-4\right)}dx$
$\frac{d}{dx}\left(\left(x^2\right)cos\left(x^2\right)\right)$
$\left(b+20\right)^2$
$ab-4ab+5ab-3ab$
$f^2+7f+1$
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