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6(x^3+y^3+z^3)^2<=(x^2+y^2+z^2)^3 OLCOMA Costa Rica Finals 2013 SL A1 d1

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September 26, 2021
algebrainequalities

Problem Statement

Let the real numbers x,y,zx, y, z be such that x+y+z=0x + y + z = 0. Prove that 6(x3+y3+z3)2(x2+y2+z2)3.6(x^3 + y^3 + z^3)^2 \le (x^2 + y^2 + z^2)^3.