6、已知两点A(4,sqrt(2),1)和B(3,0,2)，向量overrightarrow(AB)方向角为（）A. (pi)/(3),(3pi)/(4),(pi)/(3)B. (2pi)/(3),(3pi)/(4),(pi)/(3)C. (pi)/(3),(3pi)/(4),(2pi)/(3)D. (2pi)/(3),(pi)/(4),(pi)/(3)

6、已知两点$A(4,\sqrt{2},1)$和$B(3,0,2)$，向量$\overrightarrow{AB}$方向角为（）

A. $\frac{\pi}{3},\frac{3\pi}{4},\frac{\pi}{3}$

B. $\frac{2\pi}{3},\frac{3\pi}{4},\frac{\pi}{3}$

C. $\frac{\pi}{3},\frac{3\pi}{4},\frac{2\pi}{3}$

D. $\frac{2\pi}{3},\frac{\pi}{4},\frac{\pi}{3}$