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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2006
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Q)
If A and B are square matrices of size $n \times n$ such that $A^2 - B^2 = (A-B) (A+B)$, then which of the following will be always true ?
( A ) A = B
( B ) either of A or B is a zero matrix
( C ) either of A or B is an identity matrix
( D ) AB = BA
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