$\left(xy^2+y^2\right)=-x\frac{dy}{dx}$
$-31\left(-5-7+9\right)$
$\lim_{x\to\infty}\left(\frac{-6x-17}{5x^2+2x-2}\right)$
$\frac{2}{5x+n},\:c=-1$
$\frac{dy}{dt}=-y^2+y+2yt^2+2t$
$18\:\sqrt[4]{a^3}b^2$
$-12m^2n^3+9n^6+4m^4$
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