Answer
$\dfrac{1}{64}$
Work Step by Step
Using laws of exponents, the given expression simplifies to
\begin{align*}
&
\left( 8^{2} \right)^{-1}
\\&=
8^{2(-1)}
\\&=
8^{-2}
\\\\&=
\dfrac{1}{8^{2}}
\\\\&=
\dfrac{1}{64}
.\end{align*}
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