Giải phương trình (cot left( {3x - 1} ight) =  - sqrt 3 .)

A. \(x = \frac{1}{3} + \frac{{5\pi }}{{18}} + k\frac{\pi }{3}{\rm{ }}\left( {k \in Z} \right).\)

B.

\(x = \frac{1}{3} + \frac{\pi }{{18}} + k\frac{\pi }{3}{\rm{ }}\left( {k \in Z} \right).\)

C. \(x = \frac{{5\pi }}{{18}} + k\frac{\pi }{3}{\rm{ }}\left( {k \in Z} \right).\)

D. \(x = \frac{1}{3} - \frac{\pi }{6} + k\pi {\rm{ }}\left( {k \in Z} \right).\)