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If A = [[1,-1],[2,-1]], B = [[x,1],[y,-...

If ` A = [[1,-1],[2,-1]], B = [[x,1],[y,-1]] and A^2 + B^2 = (A+B)^2` then `(x,y)=` (A) `(1,4)` (B) `(2,1)` (C) `(3,3)` (D) `(4,1)`

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