Which of the following differential equations is exact? O (cos xy + xsiny) dx + (y – cos x + sin y) dy = 0 O (sin y - ysinx) dx + (cos a + xcosy - y) dy = 0 %3D O (sin x - ycosy) dæ + (xcosy- sin a + y) dy = 0 O (sin xy + ycosx) dx + (cos xy – y) dy = 0 --

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