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" 7) If "A=[[1,2],[3,4]]" ,verify that "...

" 7) If "A=[[1,2],[3,4]]" ,verify that "A(adj A)=(adjA)A=|A|I" ."

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3) If A=[[1,2],[3,4]] ,verify that A(adj A)=(adj A)A=|A|I .

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