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| 1. |
\begin{array}{c}{A=\left[ \begin{array}{cc}{1} & {2} \\ {2} & {1}\end{array}\right]} \\ {\text { show that } A^{2}-3 I=2 A, \text { where } I \text { denotes }} \\ {\text { identity matrix. }}\end{array} |
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