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- $ \\\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$.