déplacer le point A

f(x) = sin(x)
A = Point(f)
a = Tangent(A, f)
c = Circle(A, 0.5)
B, C = Intersect(c, a)
b = OrthogonalLine(B, a)
d = OrthogonalLine(C, a)
e = Circle(B, 0.5)
g = Circle(C, 0.5)
D, E = Intersect(e, b)
F, G = Intersect(g, d)
poly1, b_1, e_1, g_1, c_1 = Polygon(B, E, G, C)