IMO Shortlist 2004 problem A6


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2. travnja 2012.
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Find all functions f\colon\mathbb{R} \rightarrow\mathbb{R} satisfying the equation f\left(x^2 + y^2 + 2f\left(xy\right)\right) = \left(f\left(x + y\right)\right)^2 for all x,y\in \mathbb{R}.
Izvor: Međunarodna matematička olimpijada, shortlist 2004