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Find A^(-1) if A=|(0,1,1),(1,0,1),(1,1,0...

Find `A^(-1)` if `A=|(0,1,1),(1,0,1),(1,1,0)|` and show that `A^(-1)=(A^(2)-3I)/2`

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The correct Answer is:
`A^(-1)=(1)/(2)[(-1,1,1),(1,-1,1),(1,1,-1)]`
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