Answer
$r^{10}s^2$
Work Step by Step
$(\displaystyle \frac{r^{2}s^{4/3}}{r^{1/3}s})^{6}=\frac{r^{12}s^8}{r^{2}s^{6}}=r^{12-2}s^{8-6}=r^{10}s^2$
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