Let's assume A is a 2x2 matrix with elements a, b, c, and d:
A = \begin{bmatrix} a & b \\ c & d \end{bmatrix}
And let's define the vectors b1 and b2:
b1 = \begin{bmatrix} x1 \\ y1 \end{bmatrix}, b2 = \begin{bmatrix} x2 \\ y2 \end{bmatrix}
Now, we need to
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