Problem

From: Peper <peper@xxxxxxxx>
Date: Fri, 02 Dec 2005 01:26:49 +0100

three _positive_ real numbers a,b,c with
ab + bc + ca = 3

prove that:
a^3 + b^3 + c^3 + 6abc >= 9

Any hints how to do that?

--
Best Regards,
Peper

.

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