$S=\left ( 1+x \right )\left ( 1+\frac{1}{y} \right )+\left ( 1+y \right )\left ( 1+\frac{1}{x} \right )\geq 3\sqrt{2}+4$
Edited by Ispectorgadget, 26-04-2012 - 16:47.
Edited by Ispectorgadget, 26-04-2012 - 16:47.
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