Consider matrix \( A \) of order \( 2 \times 2 \) such that \( A^{2}=0 \). \( \operatorname{tr}(...

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Consider matrix \( A \) of order \( 2 \times 2 \) such that \( A^{2}=0 \). \( \operatorname{tr}(A)= \)
(A) 1
(B) \( -1 \)
(C) None of these
(D) undefined
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