- $ \\\mathbb{R}\\\backslash \\\left\\\{ { - \\\frac{1}{2};\\\frac{1}{2}} \\\right\\\}$.
- $ \\\mathbb{R}$.
- $ \\\left( { - \\\infty ; - \\\frac{1}{2}} \\\right) \\\cup \\\left( {\\\frac{1}{2}; + \\\infty } \\\right)$.
- $ \\\left( { - \\\frac{1}{2};\\\frac{1}{2}} \\\right)$.