l = 0 (slider from -1 to 1, step 0.001)
P: (1, 0)
f: y = (1 / l * x) - 1 / l
a = CurveCartesian(((ℯ^((l * t)) * cos(t)), (ℯ^((l * t)) * sin(t))), t, -0.25, 100)
A = Point(a)
g = Tangent(A, a)
O: (0, 0)
h = Ray(O, A)
B = Point(g)
α = Angle(B, A, O)
b: tan(α)
c: -1 / l