$\int\:4x\left(x^2+1\right)^5dx$
$\left(-640:-4\right).\left(12:2\right)$
$\frac{d}{dx}\left(\frac{x^2+y^2}{e^x}\right)$
$x^2\frac{dy}{dx}+2xy=x^4$
$\cot^{2}u+1=\frac{1}{\sen^{2}u}$
$3y^3+x^2=5$
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