Распредели элементы

Реши уравнение \({\cos 3x = -\dfrac{1}{2}}\) .

Ответ:

• \(\dfrac{2\pi k}{3}\)
• \(\dfrac{2\pi}{9}\)
• \(\dfrac{5\pi}{4}\)
• \(\dfrac{4\pi}{9}\)
• \(\pi k\)
• \(-\dfrac{\pi}{6}\)
• \(\pi n\)
• \(\dfrac{2\pi n}{3}\)

[ ] \(+\) [ ], \(n\in\Z;\)

[ ] \(+\) [ ], \(k\in\Z.\)