BPC-MAS_cv9_geometricky-vyznam-derivace.ggb

x0: 1 / 3
f(x) = ((3 * x) - 1) / ((2 * x) + 3)
a = 4 (slider from -1 to 4, step 0.33)
S1: (a, f(a))
S2: (x0, f(x0))
g = Line(S1, S2)
k: (f(a) - f(x0)) / (a - x0)
q: f(a) - (k * a)
h: y = (k * x) + q
odvesna1 = Segment((a, 0), (a, f(a)))
odvesna2 = Segment((x0, 0), (a, 0))
α = Angle(y = 0, h)
β = Angle(x = a, y = 0)