$\lim_{x\to\infty}x^2\left(\frac{1}{e}\right)^x$
$\frac{d}{dx}\left(\lim\:_{x\to\:+\infty\:}\left(\frac{x+1}{x}\right)^{\left(3x-4\right)}\right)$
$2-5-\left(-3\right)$
$\lim_{x\to0}\left(\frac{x^2\cdot e^x}{1-e^x}\right)$
$-1\cdot2x-1$
$\left(a-2\right)\left(2-a\right)$
$\frac{x^2-5x+6}{x^2+4}$
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