$\lim_{x\to0}\left(\frac{e^2-1}{3+x^2}\right)$
$\left(x+2y+2\right)^2$
$\left(2y+4\right)^4$
$\left(\frac{abc}{2x}+4x\right)\left(\frac{abc}{2x}-4x\right)$
$3\left(x-2\right)^2-48$
$\frac{d}{dx}\left(\frac{x^8\left(x-3\right)^4}{\left(x^2+7\right)^8}\right)$
$e^{-\infty^2}$
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