Given a differential equation M(x, y) + N(x, y) = 0. Suppose (N₁ - dx y)/M is a function of y only, i.e., (N₂ - My)/M = g(y) for some function g. Let μ(y) = exp (√[9(1) dy). g(y) how that µ(y)M + µ(y)Ndy = 0 is an exact equation. dx

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