Answer
$\dfrac{1}{a^2b^{2}}$
Work Step by Step
Using $a^{-n}=\dfrac{1}{a^n}$, the given expression, $
(ab)^{-2}
,$ simplifies to
\begin{array}{l}\require{cancel}
\dfrac{1}{(ab)^{2}}
\\\\=
\dfrac{1}{a^2b^{2}}
.\end{array}
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