c_1 = 2 (slider from -10 to 10, step 1)
u = ImplicitCurve(x^(2) - y^(2) - c_1)
c_2 = -3 (slider from -10 to 10, step 1)
v = ImplicitCurve((2 * (x * y)) - c_2)
A, B = Intersect(v, u)
tan_v = Tangent(A, v)
tan_u = Tangent(A, u)
α = Angle(tan_u, tan_v)