[填空题]
A circle is drawn on:ivo .k 6rx-l*exwby4y1* m de an Argand diagram as shown belowd; 8op 62h/ct8mlt(v* bezioc. The tangent to the circle from the point B(0,9) meets the ci l v/ipbm* oc8ezt6(dh82tc;orcle 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= .
