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[" 12.If "A=[[1,0,0],[0,1,0],[a,b,-1]]" ...

[" 12.If "A=[[1,0,0],[0,1,0],[a,b,-1]]" and I is the unit matrix of order "3" ,then "],[[A^(2)+2A^(4)+4A^(6)" is equal to "],[[" (a) "7Delta8," (h) "7Delta7]]]

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