Phương trình sin2x+3sin4x=0 có nghiệm là: x = k pi hoặc x = +-1/2

A. $\left[\begin{array}{l}x=\frac{k\pi }{2}\\ x=\pm \frac{1}{2}arccos(-\frac{1}{6})+k\pi \end{array}\right.(k\in Z)$

B. $\left[\begin{array}{l}x=\frac{k\pi }{2}\\ x=\pm \frac{5}{2}arccos(-\frac{1}{6})+k\pi \end{array}\right.(k\in Z)$

C. $\left[\begin{array}{l}x=\frac{k\pi }{2}\\ x=\pm \frac{1}{2}arccos(-\frac{1}{3})+k\pi \end{array}\right.(k\in Z)$

D. $\left[\begin{array}{l}x=\frac{k\pi }{2}\\ x=\pm \frac{1}{3}arccos(-\frac{1}{6})+k\pi \end{array}\right.(k\in Z)$