Answer
$\frac{r^{24}}{s^{6}}$
Work Step by Step
$(\frac{r^{8}}{s^{2}})^{3}$ = $\frac{(r^{8})^{3}}{(s^{2})^{3}}$ = $\frac{r^{8*3}}{s^{2*3}}$ = $\frac{r^{24}}{s^{6}}$
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