Y (x + y + 1) DX + (x + 2Y) dy = 0: solve by exact equation

Y (x + y + 1) DX + (x + 2Y) dy = 0: solve by exact equation

Let m (x, y) = y (x + y + 1), n (x, y) = (x + 2Y), where a is the partial guide. From this equation, we can know that a [M (x, y)] / ay = x + 2Y + 1, a [n (x, y)] / AX = 1, that is, x + 2Y + 1 = 1, that is, x + 2Y = 0, and ∫ n (x, y) DX = y ^ 2 + XY + V (x) then y (x + y + 1) = a [y ^ 2 + XY + V (x)] / A