If z(1) and z(2) are two complex numbers...

If `z_(1)` and `z_(2)` are two complex numbers such that `|(z_(1)-z_(2))/(z_(1)+z_(2))|=1`, then

`z_(1)=kz_(2), k in R`

`z_(1)=ikz_(2), k in R`

`z_(1)=z_(2)`

none of these

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