Math Chapter Wise Ordinary And Partial Differential Equations, Integral Equations And Calculus Of Variations English MCQ UP PCS (Pre) 1996 Q.Solution of the differential equation (tan-1 y – x) dy – (1 + y2) dx = 0 is: Ax = c tan–1y + tan x e −1 Bx = c tan y e −1 + 1 tan y 1 − Cy = tan–1 x + c tan x e −1 DNone of these Show answer Correct answer: None of these