Math Chapter Wise Limit, Continuity And Differentiability Of Function Of One Variable English MCQ Jharkhand TGT 2017 Q.If ((()) y z f x y x = + then ((())) ((()) y x y f ' x y x + + = + + = + + = + + = Ayzx+xzy Bxyz(xy) Cxzx+yzy Dzx + zy Show answer Correct answer: xzx+yzy