$\int_0^{\infty}\arctan\left(x\right)dx$
$\frac{dy}{dx}=-3\frac{e^{-x}}{y}$
$1-4sen10sen70$
$\lim_{x\to1}\left(\sqrt{x+2}\sqrt{2}\right)$
$\frac{d}{dx}\sqrt[5]{x}$
$y'-3y=2$
$\int\left(2x+2x^3\right)dx$
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