Math Chapter Wise Trigonometrical Identities And Circular Function English MCQ OAVS TGT 2019 Q.If 1 cosθ x= – sinθ sinθ and 1 cosθ y = + sinθ sinθ then which of the following is true. Axy = 1 Bx – y = 1 Cx + y = 1 Dx – y = 0 Show answer Correct answer: xy = 1