Math Chapter Wise Limit, Continuity And Differentiability Of Function Of One Variable English MCQ UP PGT-2016 (02-02-2019) Q.If x 1 f(x) x 2 − = + and ((()) 1 y f x − =, then dy dx is equal to A−2/1 x B3 1 x + C()2 3 1 x − D()2 3 1 x + Show answer Correct answer: ()2 3 1 x −