$\frac{x^3+6x+2}{x-3}$
$\lim_{x\to0}\left(\frac{x}{1-e^{-x}}\right)$
$\frac{5}{10}\cdot\frac{1}{-5}+\frac{1}{10}$
$2a-8b$
$3x^2+18x+9$
$\frac{\sin^2b}{\cos b}+\cos\left(b\right)=\sec\left(b\right)$
$\left(x+y-5\right)\left(x-y-5\right)$
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