Phương trình cosx + căn bậc hai của 3 sinx = 3 - 3 / cosx

A. $\left[\begin{array}{l}x=\frac{\pi }{6}+k2\pi \\ x=\frac{\pi }{3}+k2\pi \end{array}\right.(k\in Z)$

B. $\left[\begin{array}{l}x=\frac{5\pi }{6}+k\pi \\ x=\frac{\pi }{3}+k2\pi \end{array}\right.(k\in Z)$

C. $\left[\begin{array}{l}x=\frac{5\pi }{6}+k2\pi \\ x=\frac{\pi }{3}+k2\pi \end{array}\right.(k\in Z)$

D. $\left[\begin{array}{l}x=\frac{5\pi }{6}+k\pi \\ x=\frac{\pi }{3}+k\pi \end{array}\right.(k\in Z)$