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If A = [(1,-1,1),(2,-1,0),(1,0,0)] find ...

If A = `[(1,-1,1),(2,-1,0),(1,0,0)]` find `A^(2)` and show that `A^(2) = A^(-1)`.

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The correct Answer is:
`=[(1,2,3),(-2,-4,-5),(3,5,6)]`
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