essay Posted on June 25, 2016 by admin orthogonal trajectories Show that the ellipse x2/a2 + y2/b2 = 1 and the hyperbola x2/A2 – y2/B2 = 1 are orthogonal trajectories if A2 < a2 and a2 – b2 = A2 + B2 (so the ellipse and hyperbola have the same foci).