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Let $f(x)$ be a function such that $f(0)=1$ and $f(xy)=f(\frac{x^2+y^2}{2})+(x-y)^2$ for all real numbers $x$ and $y$. Find $f(x)$.

 Jan 4, 2021
 #1
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Trying a few values, I'm getting f(x) = x + 1.

 Jan 4, 2021

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