$A_{0}$

$K_{0}$

Tangente

$A_{0} + dA$

$K_{0} + dK$

dK

$dK$

$dA$

$-\frac{f_{K}}{f_{A}} dK$

$\tau$

k: 3 / 4
Q0 = 5.4 (slider from -5 to 20)
a = 0.65 (slider from -5 to 5)
A(K) = (Q0^(1 / a) * K^(((-k)) / a))
P = Point(A)
C: (x(P), 0)
D: (0, y(P))
f = Segment(D, P)
g = Segment(P, C)
h = Tangent(P, A)
Q = Point(A)
E: (x(Q), 0)
F: (0, y(Q))
i = Segment(F, Q)
j = Segment(Q, E)
B = Intersect(j, h)
G: (0, y(B))
H1: (x(C), -1)
H2: (x(E), -1)
l = Segment(H1, H2)
H3: (-2, y(D))
H4: (-2, y(F))
H5: (-3, y(D))
m = Segment(H3, H4)
H6: (-3, y(G))
n = Segment(H5, H6)
p = Segment(G, B)
τ = Angle(h, xAxis)
H = Midpoint(H5, H6)
H10: H - (0.3, 0)
I = Midpoint(H3, H4)
J = Midpoint(H1, H2)