Which of the following differential equations is exact? A B (2x - 7y) dx + (7x - 2y) dy = 0 (xe” — 2ysinx)dy + (re? – y2cosx) dx=0 (2sinx + 2xcosy) dx + (x²siny + 2cosy) dy = 0 (2x³y-3xy2) dy + (y³ + 3x²y²) dx=0

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