INEQUALITY'S BLOG

July 26, 2010

(Van Khea):Problem 008

Filed under: the new math — KKKVVV @ 6:10 pm

Let -1<x,y,z<1. Prove that:

\displaystyle \frac{1}{(1+xyz)^{2}}+\frac{1}{(1-x^{2})(1-y^{2})(1-z^{2})}\geq 2(1+xyz)

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