funktion1

f(x) = x³ / 18 - x² / 4 + 4
T = Point(f)
t = Tangent(T, f)
k = Slope(t)
N: (x(T), 0)
Q: N + (0, k)
k. = Segment(N, Q)
f'(x) = x² / 6 - x / 2
T1: "k = " + k