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z1a n dz2 lie on a circle with center at...

`z_1a n dz_2` lie on a circle with center at the origin. The point of intersection `z_3` of he tangents at `z_1a n dz_2` is given by `1/2(z_1+( z )_2)` b. `(2z_1z_2)/(z_1+z_2)` c. `1/2(1/(z_1)+1/(z_2))` d. `(z_1+z_2)/(( z )_1( z )_2)`

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