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Find A^(2) - 5A + 6I if A = [(2,0,1),(2,...

Find `A^(2) - 5A + 6I` if `A = [(2,0,1),(2,1,3),(1,-1,0)]`.

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The correct Answer is:
`[(1,-1,-3),(-1,-1,-10),(-5,4,4)]`.
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