Form the differential equation of all straight lines touching the circle `x^(2)+y^(2)=r^(2).`

Find the differential equation of all straight lines touching the circle x^2+y^2=a^2

Find the differential equation of all straight lines touching the circle x^2+y^2=a^2

Find the differential equation of all straight lines touching the circle x^2+y^2=1 .

A straight line x=y+2 touches the circle 4(x^(2)+y^(2))=r^(2), The value of r is:

Find the equation of the straight lines touching both x^(2)+y^(2)=2a^(2) and y^(2)=8ax

Form the differential equation of the family of all circles touching the y-axis at origin.

the differential equation of all circles touching a parabola y^(2)=4ax at the vertex,is

The pole of a straight line with respect to the circle x^(2)+y^(2)=a^(2) lies on the circle x^(2)+y^(2)=9a^(2) . If the straight line touches the circle x^(2)+y^(2)=r^(2) , then