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+2 votes
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in Matrices by (95 points)
If \( A=\frac{1}{3}\left[\begin{array}{ccc}1 & 2 & 2 \\ 2 & 1 & -2 \\ -2 & 2 & -1\end{array}\right] \) verify that \( A A^{\prime}=A^{\prime} A=I_{3} \).

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