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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)]` , show that `a d j\ A=3A^T` .

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`A=[[-1, -2, -2],[ 2, 1, -2], [2 , -2 , 1]]`
`C_{11}=-3` `C_{12}=-6 C_{13}=-6`
`C_{21}=6 C_{12}=-6 C_{13}=-6`
...
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