Marinada '24

[lang=hr] Neka $\sigma: \mathbb{R} \rightarrow \mathbb{R}$ $$\sigma(x+y) = \sigma(xy)$$ $$\sigma(7) = 5$$ Odredite $\sigma(11)$ [/lang] [lang=en] Let $\sigma: \mathbb{R} \rightarrow \mathbb{R}$ be a function such that: $$\sigma(x + y) = \sigma(xy)$$ $$\sigma(7) = 5.$$ Determine the value of $\sigma(11)$. [/lang]