1.
The solution of differential equation is
2.
The solution of is
3.
The solution of , is
4.
The equation of the curve passing through the origin and satisfying the differential equation is
5.
The solution of the differential equation is
6.
The solution of the equation when and is
7.
Observe the following statements
A:Interating factor of 
R: Integrating factor of 
Then, the true statement among the following is
8.
The differential equation of the family of ellipse having major and minor axes respectively along the x and y-axes and the minor axis is equal to half of the major axis, is
9.
The differential equation of system of concentric circles with centre (1,2) is
10.
The equation of family of a curve is then differential equation of the family is