If \( A \) and \( B \) are two matrices of order 3 such that \( A B=O \) and \( A^{2}+B=I \), th...
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0If \( A \) and \( B \) are two matrices of order 3 such that \( A B=O \) and \( A^{2}+B=I \), then \( \operatorname{tr}\left(A^{2}+B^{2}\right) \) is equal to
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