How do the velocities at the periapsis and apocenter of an elliptical orbit relate to the circular velocities corresponding

How do the velocities at the periapsis and apocenter of an elliptical orbit relate to the circular velocities corresponding to the distances of the periapsis and apocenter?

Pericenter: vp = vpo√1 + e; apocenter: vA = Va√1-e.

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