Orthogonal trajectories of real ellipses The family of ellipses centered at is parameterized by eccentricity . The orthogonal trajectories of this family are given by the differential equation whose general solution is the family .
Orthogonal trajectories of real ellipses The family of ellipses centered at is parameterized by eccentricity  The orthogonal trajectories of this family are given by the differential equation whose general solution is the family 