$45r^3-10r^3$
$\lim_{f\to2}\left(\frac{f+2}{f^2-4}\right)$
$\frac{d}{dx}\left(x-y^2\right)xy\:=\:0$
$5^5^5^5^5$
$27\left(-48\right)$
$-2\left(8-2r\right)+3r$
$\lim_{x\to-5}\left(\frac{x^2-12x-35}{x^2-25}\right)$
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