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Show that the matrix A = [(1,2,1),(3,2,3...

Show that the matrix `A = [(1,2,1),(3,2,3),(1,1,2)]` is non-singular and find `A^(-1)`.

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The correct Answer is:
`[(-1//4,3//4,-1),(3//4,-1//4,0),(-1//4,-1//4,1)]`
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