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Find the inverse of each of the matrices...

Find the inverse of each of the matrices given below :
Let `D= "diag" [d_(1),d_(2),d_(3)]` where none of `d_(1),d_(2),d_(3)` is ), prove that
`D^(-1)="diag" [d_(1)^(-1),d_(2)^(-1),d_(3)^(-1)]`.

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