Complex numbers - triangle, altitude

[man111]

If [tex]Z_1,Z_2,Z_3[/tex] are the complex no. representing the vertex of a Triangle inscribed in [tex]|Z|=2[/tex].
The altitute Through [tex]Z_{1}[/tex] meet the circum circle in [tex]P[/tex] ,then the complex no. corrosponding to [tex]P[/tex] is
(Ans in terms of [tex]Z_{1},Z_{2}[/tex] and [tex]Z_{3}[/tex]).