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If A = [[2,-1,1],[-1,2,-1],[1,-1,2]], Ve...

If `A = [[2,-1,1],[-1,2,-1],[1,-1,2]]`, Verify that `A^3-6A^2+9A-4I=O` and hence find `A^-1`.

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