Which of the following equations has a solution of the form F(x,y) = C A. 2x + 3y + (2y + 3x) dx dy = B. 2x + 3y + (2x + 3y) dy dx C. 3x + 2y + (3x + 2y). dy dx = = 0 0 0 D. 3x + 2y + (3y + 2x) dx = 0 dy dx

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