- $ \\\mathbb{R}\\\backslash \\\left\\\{ {\\\frac{1}{2}} \\\right\\\}$.
- $ D = \\\left[ {\\\frac{1}{2}\\\,;\\\, + \\\infty } \\\right)$.
- $ D = \\\left( {\\\frac{1}{2}\\\,;\\\, + \\\infty } \\\right)$.
- $ D = \\\left( { - \\\infty ;\\\,\\\frac{1}{2}} \\\right)$.