Math Chapter Wise Ordinary And Partial Differential Equations, Integral Equations And Calculus Of Variations English MCQ PGT 2013 Q.The differential equation M∂ ∂ ∂x+N∂ ∂ ∂y=0 is fact if- A∂ ∂ = ∂ ∂ M M x y B∂ ∂ = ∂ ∂ M N x y C∂ ∂ = ∂ ∂ N N x y D∂ ∂ = ∂ ∂ M N y x Show answer Correct answer: ∂ ∂ = ∂ ∂ M N y x