1. x²y' = 4x² + 7xy + 2y² 2. xdx + sin’(-) [ydx-xdy] = 0 3. xydx - (x+2y)²dy = 0 4. [x-yarctan()]dx + xarctan()dy = 0 5. (y+√x² + y²) dx - xdy = 0 when x = √√3, y = 1 I

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