Math Chapter Wise Tangent, Normal, Increasing, Decreasing And Maxima/Minima Of A Function Of One Variable English MCQ Haryana PGT 2019 Q.If the curves x = y2 and xy = k intersect at right angle, then: A8k2 = 3 B8k2 = 1 C8k2 = 5 D8k2 = –1 Show answer Correct answer: 8k2 = 1