$\frac{x^2}{4}-xy+y^2$
$\lim_{x\to-9}\left(\frac{x+9}{\sqrt{-4+x}-6}\right)$
$\frac{dy}{dx}=\frac{1}{22}y\left(11-2y\right)$
$+9-5+11-12+14$
$16.8-18.6$
$120-31$
$\left(-2a^4b^{-3}\right)$
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