f(x)=

dx

f(x) = (-x^(2)) + 1
P = Point(f)
x0: x(P)
fx0: f(x0)
f1: f'(x0)
c = Circle(P, 0.2)
dx = 1 (slider from -5 to 5)
a = 1
P0: (a, f(a))
Text1: "f: " + (LaTeX[a]) + " \rightarrow " + (LaTeX[f(a)]) + ""
Eingabefeld1 = Textfield(f)
Eingabefeld4 = Textfield(dx)
mt: f'(x0)
m: f'(x0)
t(x) = (m * (x - x0)) + fx0
d = Circle(P, 0.5)
A, B = Intersect(t, d)
g = Segment(A, B)