Helped my student work out the Lactus Rectum of a generic hyperbola earlier in the day, and sharing it on my main site:
http://www.whitegroupmaths.com/2014/01/ ... um-of.html
(Note: prior knowledge of a hyperbola's foci is required)
Hope this is useful. Peace.
Deriving the Lactus Rectum of a hyperbola
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