[问答题]
A circle of radius 3 and centrecv gg4oz: md(ik:5+otmm- gi/ (0,3) x9gr+ze j j.+gis drawn on an Argand diagram. The tangent to the circle from the point B(0,9) meets the cgj+rxj+.9g ezircle at the point A as shown. Let $w=\overrightarrow{\mathrm{OA}}$
