Focus Returns the focus of a conic. A conic is a set of points whose distances to some particular point, called a focus, and some particular line, called a directrix, are in a fixed ratio, called the eccentricity. Syntax focus(Conic) Description focus(Conic) Given a conic, returns its focus. It more than one focus exist, returns a list with the focus. Related functions Directrix, Conic Table of Contents Syntax Description Related functions