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Let A(0,1),B(1,1) ,C(1,-1) ,D(-1,0) be f...

Let `A(0,1),B(1,1) ,C(1,-1) ,D(-1,0)` be four points. If P is any other point, then `PA+PB+PC+PDged`, when `[d]` is where `[.]` represents greatest integer.

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