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