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Find the adjoint and the inverse of foll...

Find the adjoint and the inverse of following matrices
`[(a,0,0),(0,b,0),(0,0,c)]` if `abc!=0`

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The correct Answer is:
`[(bc,0,0),(0,ca,0),(0,0,ab)],[(1//a,0,0),(0,1//b,0),(0,0,1//c)]`
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