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 Post subject: Inequality in 2 variables
PostPosted: Sun, 15 May 2011 17:45:51 UTC 
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If x,y>0 then prove that : (1+x^2+y^2)(x^3+y+xy^3)^2\ge 9x^2y^2(1+x^4+y^4) . Equality holds for x=y=1 .
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PostPosted: Sun, 15 May 2011 18:59:36 UTC 
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