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[" 6.If "A^(3)=0," then "A^(2)+A+I=],[["...

[" 6.If "A^(3)=0," then "A^(2)+A+I=],[[" (a) "I-A," (b) "(1-A)^(-1)],[" (c) "(1+A)^(-1)," (d) "I+A]]

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