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foci_of_conic( point, point, conic) writes in the two points the foci of the conic. The third argument can be any member of the conic family.

Behaviour in degenerate cases is unspecified; in particular, if the conic is a circle, each DGS is free to return its center twice, or to write it once in the first point and leave the second point with the undefined value.


  1. foci_of_conic example: source JSXGraph