- $ \\\int {f\\\left( x \\\right){\\\text{d}}x} = 2\\\sin 2x + C$.
- $ \\\int {f\\\left( x \\\right){\\\text{d}}x} = 2x + \\\frac{1}{2}\\\sin 2x + C$.
- $ \\\int {f\\\left( x \\\right){\\\text{d}}x} = 2x - \\\frac{1}{2}\\\sin 2x + C$.
- $ \\\int {f\\\left( x \\\right){\\\text{d}}x} = 2x + \\\sin 2x + C$.