Math Chapter Wise Complex Number, De Moivre's Theorem And Nth Root Of Unity English MCQ Jharkhand TGT 2017 Q.If a complex number is given by z=(cosθ, sin θ), then (z-1/z)= A(2cos θ,0) B(0, 0) C(0, 2i cos θ) D(0, 2i sin θ) Show answer Correct answer: (0, 2i sin θ)