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

If `z_1,z_2,z_3,z_4` be the vertices of a parallelogram taken in anticlockwise direction and `|z_1-z_2|=|z_1-z_4|,` then `sum_(r=1)^4(-1)^r z_r=0` (b) `z_1+z_2-z_3-z_4=0` `a r g(z_4-z_2)/(z_3-z_1)=pi/2` (d) None of these

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