$\lim_{x\to r}\left(\frac{r^5-x^5}{r^2-x^2}\right)$
$x^3-18x^2$
$\int\frac{1}{x\left(10+2x\right)}dx$
$5\cdot40$
$\frac{x^2-12}{x^4-1}$
$\lim_{x\to0}\left(3arctan\left(\frac{x^2}{2}\right)\right)$
$9^{-1}\cdot9^4$
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