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If A and B are square matrices of the sa...

If A and B are square matrices of the same order then `(A+B)^2=A^2+2AB+B^2` implies (A) both AB and BA are defined (B) `(AB)^t=B^tA^t` (C) `(AB)^-1=B^-1A^-1 if |A|!=0` (D) `AB=BA`

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