$\lim_{n\to\infty}\left(\frac{2n}{\sqrt{n^2+1}}\right)$
$-3x-8y$
$\frac{12h^2-19h^3-4h-3+12h^5}{4h^2-1}$
$\sqrt[5]{0.00001}$
$1-8m^3$
$\lim_{x\to-1}2x^2+x-1$
$2xy^3\cdot xy^{-4}$
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