f(x) = 0.03 * x^(4) + 0.2 * x^(3) + 0.01 * x^(2)
P = Point(f)
t = Tangent(P, f)
Q: (x(P) + 1, y(P))
R: (x(P) + 1, t(x(P) + 1))
S: (x(P), 0)
T: (x(P), y(R) - y(Q))
v = 1 (slider from 0 to 1, step 0.1)
U: v * S + (1 - v) * Q
V: v * T + (1 - v) * R
a = Segment(U, V)