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... b) 2 c 2 = a 2 + b 2 − 2ab cos C − a 2 − b 2 + 2ab c 2 = 4ab sin 2 (C /2) c 2 , we have exp  (a − b) 2 c 2 + (a − c) 2 b 2 + (b − c) 2 a 2  ≤ c 2 4ab sin 2 (C /2) b 2 4ac sin 2 (B /2) a 2 4bc sin 2 (A /2) = R 2 4r 2 . This ... 171 123 456789 6459783 12 89 723 1564 9783 126 45 23 1564897 456789 123 56489 723 1 789 123 456 3 126 45978 123 456789 789 123 456 456789 123 23 1564897 89 723 1564 56489 723 1 3 126 45978 9783 126 45 6459783 12 123 456789 89 723 1564 6459783 12 56489 723 1 3 126 45978 789 123 456 9783 126 45 456789 123 23 1564897 123 456789 9783 126 45 56489 723 1 89 723 1564 456789 123 3 126 45978 6459783 12 231564897 789 123 456 Editorial ... mutually orthogonal p 2 × p 2 Latin Sudoku squares. 123 456789 456789 123 789 123 456 3 126 45978 6459783 12 9783 126 45 23 1564897 56489 723 1 89 723 1564 123 456789 56489 723 1 9783 126 45 6459783 12 789 123 456 23 1564897 89 723 1564 3 126 45978 456789 123 February...

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