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