[Solution] For the matrix A=[cccc1 1 2 1 , 0 -2 0 0 , 1 2 1 -2 , 0 3 2 1] find the inverse, if it exists calculate
Question: For the matrix \(A=\left[\begin{array}{cccc}1 & 1 & 2 & 1 \\ 0 & -2 & 0 & 0 \\ 1 & 2 & 1 & -2 \\ 0 & 3 & 2 & 1\end{array}\right]\)
- find the inverse, if it exists
- calculate \(\operatorname{det}(A)\)
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