If z1 and z2 are two complex numbers suc...

If `z_1 and z_2` are two complex numbers such that `|(z_1-z_2)/(z_1+z_2)|=1,` then

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

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

`z_(1) = z_(2)`

None of these

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