Which of the following equations is an exact DE?
- A. (x2 + 1) dx – xy dy = 0
- B. x dy + (3x – 2y) dx = 0
- C. 2xy dx + (2 + x2) dy = 0
- D. x2y dy – y dx = 0
The correct answer is C. 2xy dx + (2 + x2) dy = 0.Solution:
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