If `A=[[1,2, 3],[ 3,-2 ,1],[ 4, 2, 1]]`, then show that `A^3-23 A-401=0`.

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If `A=[[1,2, 3],[ 3,-2 ,1],[ 4, 2, 1]]`, then show that `A^3-23 A-401=0`.
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