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- $ F\\\left( x \\\right) = 2\\\cos 2x$
- $ F\\\left( x \\\right) = \\\frac{1}{2}\\\cos 2x$.
- $ F\\\left( x \\\right) = {\\\sin ^2}x$.
- $ F\\\left( x \\\right) = - \\\cos 2x + 5$.