a = Point(xAxis)
b_1 = OrthogonalLine(a, xAxis)
f(x) = x^(2) - 12 x + 40
A = Intersect(f, b_1)
d = OrthogonalLine(A, b_1)
b = Intersect(yAxis, d)
B: (y(b), 0)
c = OrthogonalLine(B, xAxis)
C = Intersect(f, c)
e = OrthogonalLine(C, c)
D = Intersect(yAxis, e)
E: (y(D), 0)
g(x) = f(f(x))
h(x) = x