f(x)=

dx

B = (2, 1)
A = (-2, 4)
f(x) = (0.25 * x^(2))
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)
t = Line(A, B)
mt: f'(x0)
m = Slope(t)
bt: t(0)