a = 1 (slider from -5 to 5, step 0.1)
b = 0 (slider from -5 to 5, step 0.1)
c = 0 (slider from -5 to 5, step 0.1)
d = 0 (slider from -5 to 5, step 0.1)
f(x) = a * x^(3) + b * x^(2) + c * x + d
A = Point(f)
r = 1.3 (slider from -5 to 5, step 0.1)
e = Circle(A, r)
g = Tangent(A, f)
B, C = Intersect(e, g)
text1: "y = " + f + ""