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A triangle ineq - well known

Source: Indian RMO 1995 Problem 5

October 26, 2005
inequalitiesquadratics

Problem Statement

Show that for any triangle ABCABC, the following inequality is true: a2+b2+c2>3max{a2b2,b2c2,c2a2}. a^2 + b^2 +c^2 > \sqrt{3} max \{ |a^2 - b^2|, |b^2 -c^2|, |c^2 -a^2| \} .