Graph anzeigen

A = (0, 0)
B = (2.5703626014097174, 1.4465268050730244)
C = (5, 0)
L: {A, B, C}
f = FitPoly(L, 2)
show = false
Text1: "f(x)=" + (LaTeX[If[show ≟ true, Text[f], Text["???"]]]) + ""