$x^2\left(x^4-2+x^{-4}\right)$
$18x^2-13x-21$
$\frac{d}{dx}\left(\left(xy+y^2\right)=x\right)$
$\frac{r+1}{2}\ge1$
$\frac{d}{dx}\:6x^3y-2x^2=40$
$2\left(4m+1\right)+8m$
$\left(3x^5+5y^5\right)^2$
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