f(x) = x^(2.0) - 2.0 * sqrt(x + 2.0)
A = Point(f)
B = Point(f)
a = Line(A, B)
c: (y(A) - y(B)) / (x(A) - x(B))
f'(x) = f'(x)
b: y = c
D = Intersect(f', b, (1.1944885315831815, 1.8294780390853733))
C: (x(D), f(x(D)))
d = Tangent(C, f)
e = Segment(A, B)
g = Circle(C, e / 4.0)
E, F = Intersect(g, d)
u = Vector(C, F)
v = Vector(C, E)

Tool: Projection
Projette un point sur l'axe
Input: A
Output: a, b

B: (x(A), 0.0)
C: (0.0, y(A))
a = Segment(A, C)
b = Segment(A, B)