[问答题]
Consider the functio, 5;3ry)85bwl,x zfpomgw lfrle v/iwf6ew6j6tl8z :s4hu2 k -oxmo1n $f(x)=\sin \left(\frac{\pi}{12}-\frac{x}{4}\right)$ for $ x \in \mathbb{R}$ .
1. Show that the y -intercept of f(x) is $\frac{\sqrt{6}-\sqrt{2}}{4} $
2. Find the least positive value of x for which $ f(x)=\frac{\sqrt{3}}{2}$ .
