Find \( A^{-1} \) if \( A=\left[\begin{array}{lll}0 & 1 & 1 \\ 1 & ...

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Find \( A^{-1} \) if \( A=\left[\begin{array}{lll}0 & 1 & 1 \\ 1 & 0 & 1 \\ 1 & 1 & 0\end{array}\right] \). Also show that
P
W
\[
A^{-1}=\frac{A^{2}-3 I}{2}
\]
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