Jumat, 17 September 2010

44th Polish Mathematical Olympiad Problems 1993

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44th Polish Mathematical Olympiad Problems 1993A1.  Find all rational solutions to: t2 - w2 + z2 = 2xy t2 - y2 + w2 = 2xz t2 - w2 + x2 = 2yz. A2.  A circle center O is inscribed in the quadrilateral ABCD

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