III. Obtain the solution using Integrating Factors Found by Formulas 1. 2(2y2+5xy- 2y + 4)dx+x(2x + 2y - 1)dy = 0 2. y(y+2x-2)dx-2(x + y)dy = 0 3. xydx(x²+2y²)dy = 0

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