$\lim_{u\to5}\left(\frac{\sqrt{u+4}-\sqrt{3}}{u-5}\right)$
$\left(4a+b\right)\left(3a-b\right)$
$-3\left(-6\right)\left(-2\right)$
$19\cdot150\cdot380$
$\lim_{x\to2}\left(\sqrt{x^2+1}-x\right)$
$\lim_{z\to-2}\left(z^3\:+\:8\right)$
$\frac{x^5}{x^2+9}$
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