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Det er gitt en funksjon $f:\\{(0,0)\\}\\cup\\{(x,y)|x\\geq5, y\\geq5\\}\\rightarrow\\mathbb{R}$

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$f(x,y)=\\Bigg\\{ \\begin{matrix} \\dfrac{x^2+xy^2-y}{x^2+y^2} & hvis\\ (x,y)\\neq(0,0) \\\\ 0 & hvis\\ (x,y)=(0,0) \\end{matrix}$

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Punktet $(0,0)$ er et isolert punkt av $\\{(0,0)\\}\\cup\\{(x,y)|x\\geq5, y\\geq5\\}$

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Velg en riktig påstand 

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