- $ F(x) = \\\frac{1}{2}\\\ln \\\left| {2x + 1} \\\right| + C$.
- $ F(x) = 2\\\ln \\\left| {2x + 1} \\\right| + C$.
- $ F(x) = \\\ln \\\left| {2x + 1} \\\right| + C$.
- $ F(x) = \\\frac{1}{2}\\\ln (2x + 1) + C$.