Вычислите первообразную \(f(x)\) = \(cos ( 3x + \frac{\pi}{6} ).\)
\(F(x) = \frac{1}{3} sin ( 3x + \frac{\pi}{6} )\)
\(F(x) = - \frac{1}{3} sin ( 3x + \frac{\pi}{6} )\)
\(F(x) = 3 sin ( 3x + \frac{\pi}{6} )\)