$\lim_{x\to\infty}\left(\frac{e^{-x}}{x^3}\right)$
$\int\left(-\frac{4x^3}{sqrt\left(4x^4+3\right)}\right)dx$
$\left(cosx\:-xsenx\:+\:y^2\right)dx+\:2xydy\:=0$
$\int\frac{\left(\sqrt{10-x^2}\right)}{3x^2}dx$
$4n^2\left(5n+3\right)$
$\int\frac{1}{\sqrt{5-4x-x^2}}dx$
$2-\frac{y}{x}$
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