$\lim_{u\to5}\:\frac{4}{u-7}$
$m^2+20+49$
$\left(-2+h\right)^2$
$\lim_{x\to\infty}\left(\frac{x+1}{x+3}\right)$
$5xyz\left(yz^2\right)+5\left(x^2+xy\right)$
$\lim_{x\to\infty}\left(x+1\right)^{x+1}$
$\lim_{x\to0}\left(\frac{e^{2x}-1-20x}{400x^2}\right)$
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