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CWMO 2011 Problem 6

    Let a,b,c>0a,b,c > 0 , prove that (a−b)2(c+a)(c+b)+(b−c)2(a+b)(a+c)+(c−a)2(b+c)(b+a)≥(a−b)2a2+b2+c2\frac{(a-b)^2}{(c+a)(c+b)} + \frac{(b-c)^2}{(a+b)(a+c)} + \frac{(c-a)^2}{(b+c)(b+a)} \geq \frac{(a-b)^2}{a^2+b^2+c^2}

    Dataset text AI-MO AoPS. Quoted with source.

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