[br]\begin{bmatrix}[br]a & c \\[br]b & d [br]\end{bmatrix}\begin{bmatrix} 1 \\ 0 \end{bmatrix} = \begin{bmatrix} a \\ b \end{bmatrix}
[br]\begin{bmatrix}[br]a & c \\[br]b & d [br]\end{bmatrix}\begin{bmatrix} 1 \\ 0 \end{bmatrix} = \begin{bmatrix} a \\ b \end{bmatrix}
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