Level:
Project ID:
2010010705
Source Problem:
Accepted:
0
Clonable:
1
Easy:
1
The solution set of the equation \( \cos\!\left(2\varphi + \frac{\pi}6\right) = - 1\) for \( \varphi \in [ 0;2\pi]\) is:
\(\left\{ \frac{5\pi}{12}; \frac{17\pi}{12}\right\}\)
\(\left\{ \frac{5\pi}{12}; \frac{11\pi}{12}\right\}\)
\(\left\{ \frac{7\pi}{12}; \frac{13\pi}{12}\right\}\)
\(\left\{ \frac{7\pi}{12}; \frac{17\pi}{12}\right\}\)