$\frac{x}{x-3}-\frac{4}{x}=\frac{3}{x-3}$
$81^9$
$\frac{d}{dx}x^2y^2=e\ln\left(xy\right)$
$\frac{dr}{dt}=\:t\:\cdot\:\frac{r^2+1}{t^2-1}$
$\int x^{m-2}dx$
$w=e^{8-8u}$
$\lim_{x\to0}\left(\tan\left(\tan\left(x\right)\right)\right)^x$
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