Which of the function is not an exact equation of the first order? OA (e³ + ycosx)dx + (xe³ + sinx + 1)dy = 0 O B. (cosx.cosy — cotx)dx – sinx.sinydy= 0 OC. 3y (x²-1)dx — sinx. sinydy = 0 OD (3x² - 2y + ex+y)dx + (−ex+y − 2x + 4)dy = 0 O E. All of the Choices

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