Math Chapter Wise Complex Number, De Moivre's Theorem And Nth Root Of Unity English MCQ PGT 2003 Q.If 3, x iy a ib + = + + = + + = + + = + then A2 2 () − = + x y a b B2 2 () − = − x y a b C2 2 () + = − x y a b DNone of these Show answer Correct answer: None of these