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IF A=[{:(-1,-2,-2),(2,1,-2),(2,-2,1):}] ...

IF `A=[{:(-1,-2,-2),(2,1,-2),(2,-2,1):}]` then show that adj `A=3A^T`. Also find `A^-1`.

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The correct Answer is:
`1/9[{:(-1,2,2),(-2,1,-2),(-2,-2,1):}]`
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