If z1,z2,z3,z4 be the vertices of a quad...

If `z_1,z_2,z_3,z_4` be the vertices of a quadrilaterla taken in order such that `z_1+z_2-z_2+z_3 and |z_1-z_3|=|z_2-z_4|` then arg `((z_1-z_2)/(z_3-z_2))=` (A) `pi/2` (B) `+- pi/2` (C) `pi/3` (D) `pi/6`

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