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If A and B be two complex numbers such ...

If `A and B` be two complex numbers such that `|1 – A'B|^2 - |A – B|^2 = K(1 - |A|^2) (1 - |B|^2)` then the value of k is (A) 1 (B) 2 (C) `1/2` (D) `1/3`

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