Which of the following is an exact DE? A none of the given choices (4x²– y²) dx + x(x- 2y)dy=0 B c) 3lnx secy dx - 5xsin2y dy =0 D csc(x²+ 1) y' – xcosy dy =0 E ycos(xy) dx +[2y +xcos(xy)]dy=0

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