$\frac{3x^3+2x^2-8}{x\:-4}$
$\lim_{x\to3}\left(\frac{-4.9x^2+396.9-\left(-4.9x^2+396.9\right)}{x-3}\right)$
$\int\frac{1}{\left(1+e^{-2x}\right)e^x}dx$
$\left(q+5\right)\left(q-5\right)$
$\left(2m+3n\right)\left(4a+b^2\right)$
$\lim_{x\to0}\frac{\cot\left(3x\right)}{\cot\left(2x\right)}$
$\lim_{x\to0}\left(\frac{2-2\cdot x\cdot e^{-x}-2\cdot e^{-x}}{\left(1-e^{-x}\right)^2}\right)$
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