- 1−2[4−2−31]frac{1}{-2}begin{bmatrix}4 & -2\-3 & 1end{bmatrix}
- 12[4−2−31]frac{1}{2}begin{bmatrix}4 & -2\-3 & 1end{bmatrix}
- 12[1−2−34]frac{1}{2}begin{bmatrix}1 & -2\-3 & 4end{bmatrix}
- [4−2−31]begin{bmatrix}4 & -2\-3 & 1end{bmatrix}
If A = [1234]begin{bmatrix}1 & 2\3 & 4end{bmatrix}, then A⁻¹ = ?
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