$\int\:\:x^3e^{-2x}dx$
$x^2-2x>24$
$\lim_{x\to-2}\left(\frac{x^2-x-2}{x+1}\right)$
$\int x^2\left(x^4+3\right)^2dx$
$\lim_{x\to0}\left(\frac{1-\cos\left(2x\right)}{2x^2}\right)$
$4a^2-12an+9n^2$
$\left(x^2\:+1\right)^3$
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