[填空题]
1. Show that $\log _{2} \sqrt{3-\cos 2 x}=\log _{4}(3-\cos 2 x)$ .$\log _{a}(b-\cos c x)$ a = b = c =
2. Hence, or otherwise, solve $\log _{4}(3 \sin x)+\frac{1}{4}=\log _{2} \sqrt{3-\cos 2 x}$ , for $0\lt x \lt \frac{\pi}{2}$ .$\frac{\pi}{a}$ a =
