Math Chapter Wise Complex Number, De Moivre's Theorem And Nth Root Of Unity English MCQ JDD-75-PGT TIER II-X-15 28.06.2015 Q.lf x cos isin, = θ − θ = θ − θ = θ − θ = θ − θ then 3 3 1 x − − equal to- A2isin 3θ B2isin 3/− θ C2cos3θ Dnonc of these Show answer Correct answer: 2isin 3/− θ