If \( \mathrm{A} \) is a skew- symmetric matrix, then trace of \( \...

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If \( \mathrm{A} \) is a skew- symmetric matrix, then trace of \( \mathrm{A} \) is
(1) 1
\( (2)-1 \)
\( \mathrm{P} \)
(3) 0
(4) 2
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