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$[\begin{array}{c} 1 & - 1 \\ 1 & 1 \\ - 1 & - 1 \end{array}]$

Bước 1

Transpose the matrix by switching its rows to columns.

$[\begin{array}{c} 1 & 1 & - 1 \\ - 1 & 1 & - 1 \end{array}]$