#### Problem Statement:

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

#### Problem Answer:

The correct answer is **C. 2xy dx + (2 + x2) dy = 0**.

Solution:

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