Punkte ein/aus

f_1(x) = x^(2)
a = 0.5 (slider from -5 to 5)
f(x) = (a * x^(2))
P = Point(f_1)
P': (x(P), f(P))
g = Segment((x(P), 0), (x(P), f_1(P)))
h = Segment((x(P') + 0.05, 0), (x(P') + 0.05, f(P')))
Text1: "f(x) = " + (LaTeX[f_1]) + ""
f_{2}(x) = x^(2)
P_{1} = Point(f_{2})
Text1_{1}: "f(x) =" + (LaTeX[f]) + ""
b = false