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TOT 488 1996 Spring J A1 a^2 + b^2 - ab = c^2

Source:

August 16, 2024
inequalitiesalgebra

Problem Statement

Prove that if a,ba, b and cc are positive numbers such that a2+b2ab=c2,a^2 + b^2 - ab = c^2, then (ac)(bc)<0.(a - c)(b - c) < 0.
(A Egorov)