Which of the function is not an exact equation of the first order? A. (e³ + ycosx)dx + (xe³ + sinx + 1)dy = 0 B. (cosx. cosy - cotx)dx - sinx.sinydy |3y (x² − 1)dx – sinx. sinydy = 0 - - D. (3x² - 2y + ex+y)dx + (−ex+y - 2x + 4)dy = 0 E. F. All of the Choices None of the Choices = 0

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