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If A={:[(2,0,1),(1,0,-1),(0,-1,1)]:}, f...

If `A={:[(2,0,1),(1,0,-1),(0,-1,1)]:},` find the matrix for the polynomial `A^(2)-4A+3I.`

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The correct Answer is:
`{:[(-1,-1,-1),(-2,4,4),(-1,3,1)]:}`
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