Math Chapter Wise Limit, Continuity And Differentiability Of Function Of One Variable English MCQ UP PGT 2021 Q.If x y = y x, then dy y d x is equal to – Alog y y y log + x x x Blog y – y ylog – x x x Clog x x x log + y y y Dlog – log – y x x x y y Show answer Correct answer: log y – y ylog – x x x