O = Intersect(xAxis, yAxis)
a = 3.5 (slider from 0 to 5, step 0.1)
c = Circle(O, a)
A = Point(c)
u = Vector(O, A)
b = 1.9 (slider from 0 to 5, step 0.1)
d = Circle(O, b)
α = 2.443460952792061 rad (slider from 0 to 6.283185307179586, step 0.08726646259971647)
A' = Rotate(A, α, O)
β = Angle(A, O, A')
f = Segment(A', O)
B = Intersect(d, f)
g = Segment(B, O)
v = Vector(O, B)
texte1: "\overrightarrow{u}.\overrightarrow{v}=" + (LaTeX[a]) + "*" + (LaTeX[b]) + "*cos(" + (LaTeX[α]) + ")=" + (LaTeX[((a * b) * cos(Angle[B, O, A]))]) + ""