Why this locus "lugar1" keeps indefinite?

Author:Haroldo Stenger

I'm trying to construct a parabola. I used the fact that in order for the point F to be equidistant to the line f and the point C, it must be the vertex of the isosceles triangle CFD, being D a point in f.

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Reto final: cuando falla la continuidad
Tasa de variación media 2
Teorema de Bolzano. Contraejemplos.
Derivada implícita
Punto medio

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