x_{0}

x_{1}

x_{2}

x_{3}

f(x) = exp((-x)) - x^(2)
x0 = -1.86 (slider from -3 to 3)
P0: (x0, f(x0))
X0: (x0, 0)
g = Segment(P0, X0)
h = Tangent(P0, f)
A = Intersect(xAxis, h)
B = Intersect(f, xAxis, (0.7034674224983918, -2.220446049250313E-16))
P1: (x(A), f(x(A)))
i = Tangent(P1, f)
C = Intersect(xAxis, i)
j = Segment(A, P1)
P2: (x(C), f(x(C)))
k = Segment(C, P2)
l = Tangent(P2, f)
D = Intersect(xAxis, l)