- $ \\\frac{{{x^2}}}{2}\\\ln x - \\\frac{{{x^2}}}{4}$.
- $ \\\frac{{{x^2}}}{2}\\\ln x - \\\frac{{{x^2}}}{4} + C$.
- $ \\\frac{{{x^2}}}{2}\\\ln x + \\\frac{{{x^2}}}{4} + C$.
- $ \\\frac{x}{2} + C$.