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[" 10If "A" and "B" are square matrices ...

[" 10If "A" and "B" are square matrices such that "],[AB=B" and "BA=A" ,then "A^(2)+B^(2)" is equal "],[" to- "],[[" (A) "2AB," (B) "2BA],[" (C) "A+B," (D) "AB]]

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