Let z1a n dz2 be complex numbers such th...

Let `z_1a n dz_2` be complex numbers such that `z_1!=z_2` and `|z_1|=|z_2|dot` If `z_1` has positive real part and `z_2` has negative imaginary part, then `(z_1+z_2)/(z_1-z_2)` may be (a) zero (b) real and positive (c) real and negative (d) purely imaginary

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