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Find the inverse of [2-1 1-1 2-1 1-1 2]...

Find the inverse of `[2-1 1-1 2-1 1-1 2]`

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To find the inverse of the matrix \[ A = \begin{bmatrix} 2 & -1 & 1 \\ -1 & 2 & -1 \\ 1 & -1 & 2 \end{bmatrix} ...
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