Étude de la courbe représentative d'une fonction
Author: Patrice Debart

f = Function((1.0 - sqrt(x))^(2.0), 0.0, 1.0)
g = Function(f(f(x)), 0.0, 1.0)
O = (0, 0)
I = (1, 0)
K = (1, 1)
OI = Segment(O, I)
OK = Segment(O, K)
P = Point(OI)
a: x(P)
M: (a, f(a))
M' = Mirror(M, OK)
a': x(M')
P': (a', 0.0)
Q: (0.0, a')
Q': (0.0, a)
PM = Segment(P, M)
QM = Segment(M, Q)
P'M' = Segment(P', M')
Q'M' = Segment(M', Q')
MM' = Segment(M, M')