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VTMO 2026 - Grade 9 - Final - SET 11 - Self-study Question 3

VTMO · VTMO 2026 - Grade 9 - Final - SET 11 - Self-study

Question 3

Let $a,b,c$ be pairwise distinct real numbers. Find the minimum of
$$P=\frac{(a-b)^4}{(b-c)^2(c-a)^2}+\frac{(b-c)^4}{(c-a)^2(a-b)^2}+\frac{(c-a)^4}{(a-b)^2(b-c)^2}.$$