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- $ D = \\\left( {0; + \\\infty } \\\right)$.
- $ D = \\\left[ {0; + \\\infty } \\\right)$.
- $ D = \\\left[ {\\\frac{1}{3}; + \\\infty } \\\right)$.
- $ D = \\\left( {\\\frac{1}{3}; + \\\infty } \\\right)$.