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यदि A=[[2,-1,1],[-1,2,-1],[1,-1,2]] तो ...

यदि `A=[[2,-1,1],[-1,2,-1],[1,-1,2]]` तो सत्यापित कीजिये की `A^3-6A^2+9A-4I =O` है तथा इसकी सहायता से `A^-1` ज्ञात कीजिये ।

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If A = [[2,-1,1],[-1,2,-1],[1,-1,2]] , Verify that A^3-6A^2+9A-4I=O and hence find A^-1 .

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