Ha 2004

c = 0.1
a = 0.26
f(x) = a * (x + 2) * (x - 1) * (x - 3) + c
g(x) = f(x)^(2)
A, B = Extremum(f)
C, D, E, F, G = Extremum(g)
b = Line(D, A)
d = Line(B, E)
e = Line(F, B)