Which of the following equations is/are exact? □ 3x²y² dx + (2x³y + 4y³) dy = 0 (3x²y-x²) dx + e³ dy = 0 □ (y + 2xy³) dx + (1+3x²y² + x) dy = 0 □ (xy+1) dx + (xy-1) dy=0

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