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[" If "A=[[alpha,beta],[gamma,-alpha]]" is such that "A^(2)=I" ,then "],[[" (A) "1+alpha^(2)+beta gamma=0," (B) "1-alpha^(2)+beta gamma=0],[" (C) "1-alpha^(2)-beta gamma=0," (D) "1+alpha^(2)-beta gamma=0]]

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