Answer
$\frac{1}{s^{15}}$
Work Step by Step
The given expression is
$=(s^{-5})^{3}$
Use $(a^n)^m=a^{n\cdot m}$.
$=(s)^{-5\cdot 3}$
Simplify.
$=s^{-15}$
Use $a^{-n}=\frac{1}{a^n}$.
$=\frac{1}{s^{15}}$.
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