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Let $A=\left[\begin{array}{ccc}0 & 0 & -1 \\ 0 & -1 & 0 \\ -1 & 0 & 0\end{array}\right], B=\left[\begin{array}{lll}0 & 1 & 0 \\ 1 & 0 & 0 \\ 0 & 0 & 1\end{array}\right]$ then $\left(A^{-1} B\right)^{-1}+$ $\left(\mathrm{AB}^{-1}\right)^{-1}=$
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The correct answer is:
$\left[\begin{array}{ccc}0 & -2 & 0 \\ 0 & 0 & -2 \\ -2 & 0 & 0\end{array}\right]$
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