Determine whether differential equations below are exact or not. 1. cosy + x²y + sinx + x COSX + xy = 0. dy dx 2. 2x³ - xy² - 2y + 3 dx- x²y + 2x dy = 0 dy 3. 2xe + x²e + cosy = 0 dx 3 4. 3x²y - 1 dx + x³ + 6y-y² dy = 0 5. 3x²y + e dx + x³ + xe- 2y dy = 0.

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