$\frac{1}{2}y^2-y$
$\sqrt[2.1]{9}$
$-4a\:-\:2b\:+\:3b$
$\left(r^2+r-1\right)-\left(3r^2+4r-5\right)$
$\frac{dr}{dx}=\frac{r^2}{x}$
$-6a^2-3a+3a^2$
$\int_1^2\left(-6x+12\right)dx$
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