[填空题]
A circle is drawn on an Argand diagram as shown beo;q+nlc:g1.w6k-g m ybqk*hd low. The tangendk. 6 ja;xumu08f.jkkt to the circle from the point B(0,9) meets uxk 0.;8ad jmf k.jku6the circle at the point A as shown. Let w= OA$^{→}$.
1.Show that ∣w∣=3$\sqrt{3}$.
2.Find arg w.w=$\frac{\pi}{x}$,x= .
3.Hence write w in the form a+bi where a,b∈R.
w=$\frac{3\sqrt{3}}{x}+\frac{y}{2}i$,x= , y= .
