Math Chapter Wise Limit, Continuity And Differentiability Of Function Of Two Variables And Partial Differentiation English MCQ UP PCS (Pre) 1996 Q.If 2 2 2 r x y, then 2 2 r r x y is equal to– A2 1 r r x y r B2 r r x y C2 1 r r x y r DNone of these Show answer Correct answer: None of these