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[" 2.If "A=[[5,5a,a],[0,a,5a],[0,0,5]]" ...

[" 2.If "A=[[5,5a,a],[0,a,5a],[0,0,5]]" and "|A^(2)|=25" than "|a|=],[[" (a) "5," (b) "(1)/(sqrt(5))]],[" (c) "(1)/(5)," (d) "(1)/(25)]

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