1.

If A=[{:(2,-1,1),(-1,2,-1),(1,-1,2):}] Verify the result A^3-6A^2+9A-4I=O and hence find A^(-1)

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ANSWER :`thereforeA^(-1)=1/4[{:(3,1,-1),(1,3,1),(-1,1,3):}]`


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