For the matrix \( A=\left[\begin{array}{ll}1 & 5 \\ 6 & 7\end{array}\right] \), verify that \( \...

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For the matrix \( A=\left[\begin{array}{ll}1 & 5 \\ 6 & 7\end{array}\right] \), verify that \( \mathrm{A}-\mathrm{A}^{\prime} \) is a skew-symmetric matrix.
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