1.

Let z_(1) and z_(2) be complex numbers such that z_(1)nez_(2) and abs(z_(1)) and abs(z_(2)). If Re(z_(1))gt0 and Im(z_(2))lt0, then (z_(1)+z_(2))/(z_(1)-z_(2)) is

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one
real and positive
real and negative
purely imaginary

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