For any matrix \( A \) with real number entries, then \( A- \) \( \...

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For any matrix \( A \) with real number entries, then \( A- \)
\( \mathrm{P} \)
\( A^{\prime} \) is a
W
(1) symmetric matrix
(2) skew symmetric matrix
(3) identity matrix
(4) null matrix
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