TeX джерело:

\lim\limits_{x\to 2}\frac{\sqrt{x+7}-3}{1-\sqrt{x-1}}=\{\frac{0}{0}\}=\lim\limits_{x\to 2}\frac{(\sqrt{x+7}-3)(\sqrt{x+7}+3)}{(1-\sqrt{x-1})(\sqrt{x+7}+3)}=\lim\limits_{x\to 2}\frac{(x+7-9)}{(1-\sqrt{x-1})(\sqrt{x+7}+3)}=