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Which of the following is no true? (A) ...

Which of the following is no true?
(A) `(A\')\'=A`
(B) `(A-I)(A+I)=0` such that `A^2=I`
(C) `(AB)^n=A^nB^n where n epsilonN and AB=BA`
(D) `(A+B)(A-B)=A^2-B^2, A and B` being square matrices of the same type

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