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[" 5.If "z_(1),z_(2)" are two complex numbers such that "(z_(1)-z_(2))/(|z_(1)+z_(2)|)=1],[" and "iz_(1)=kz_(2)," where "k in R," then the angle between "z_(1)-z_(2)],[" and "z_(1)+z_(2)" is "],[[" (a) "tan^(-1)((2k)/(k^(2)+1))," (b) "tan^(-1)((2k)/(1-k^(2)))],[" (c) "-2tan^(-1)k," (d) "2tan^(-1)k]]

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