$\frac{1-v^{12}}{1-z^6}$
$\left(-3a^2b\right)\cdot\left(8ab^5\right)$
$\frac{r^{-9}}{r^{-55}}$
$\int\frac{5x+3}{x^2+x+1}dx$
$\int y\:sin\left(x^2\right)dy$
$43.25\cdot5$
$\left(2x-3y\right)\left(5x-3y\right)$
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