Urèete limitu (pokud existuje):
$$
\lim_{(x,y) \to [0,0]}\frac{xy}{\sqrt{x^2 + y^2}}, \qquad
\lim_{(x,y) \to [0,0]}\frac{x + y}{\sqrt{x^2 + y^2}}, \qquad .
$$
