If A=[(a,b),(c,d)], where a, b, c and d ...

If `A=[(a,b),(c,d)]`, where a, b, c and d are real numbers, then prove that `A^(2)-(a+d)A+(ad-bc) I=O`. Hence or therwise, prove that if `A^(3)=O` then `A^(2)=O`

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