Problem 4.Find general solution for the ordinary differential equation 2xyy' = x²+2y² Problem 5. Find general solution for the ordinary differential equation dy dx = 4x² + 3y² 2xy Problem 6. Find general solution for the ordinary differential equation 2xy + y = 10√x Problem 7. Solve the initial value problem (1+x)y' + y = cos(x), y(0) = 1.