Editor
The value of $\int_{\frac{\pi}{6}}^{\frac{\pi}{3}} \frac{dx}{\sin2x}$ is equal to:
Difficulty: Easy
A: 
$ln\frac{1}{\sqrt{2}}$
B: 
$ln\frac{\sqrt{2}}{2}$
C: 
$\frac{\sqrt{3}}{2}$
D: 
$ln\sqrt{3}$