Math Chapter Wise Limit, Continuity And Differentiability Of Function Of One Variable English MCQ Haryana PGT 2020 Q.If x = a(1 + cos 2θ) sin 2θ; y = b(1 – cos2θ) cos 2θ, then dy = dx Ab cot a θ Bb tan a θ Cb sin 2 cos2. a cos θ − θ Da sin b θ Show answer Correct answer: b tan a θ