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Perpendicular Medians and Trig

Source: CMO 1993 Problem 3

January 25, 2007
trigonometrysymmetry

Problem Statement

In triangle ABC,ABC, the medians to the sides AB\overline{AB} and AC\overline{AC} are perpendicular. Prove that cotB+cotC23.\cot B+\cot C\ge \frac23.