1. Find the general solution of (general integral) of the differential equation.
1.25 cosydx = 2√1 + x2 dy + cosy√1 + x2 dy

2. Find the general solution of (general integral) of the differential equation.
2.25 (y + 1) y = y / √1-x2 + xy

3. Find the general solution of (general integral) of the differential equation.
3.25 (y2 - 2xy) dx - x2dy = 0

4. Find a particular solution of (partial integral) of the differential equation.
4.25 (1 - x2) y + xy = 1, y (0) = 1.

5. Find the general solution of the differential equation.
5.25 y + 2xy = 2x3y3

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