Math Chapter Wise Limit, Continuity And Differentiability Of Function Of One Variable English MCQ UKPSC Lecturer (Mains) 2020 Q.If xy yx = 1, than dy dx is: Ae y(y + log y) x Be y(+ log) (y + log y) x y x x x Ce –y(+ log) (+ y log y) y x y x x D– – y 1 1 yx x Show answer Correct answer: e –y(+ log) (+ y log y) y x y x x