Sym_2

a = 1 (slider from -5 to 5, step 0.1)
b = 1 (slider from -5 to 5, step 0.1)
c = 1 (slider from -5 to 5, step 0.1)
f(x) = a x^(4) + b x^(3) + c x^(2)
A = Point(yAxis)
B = Point(yAxis)
d = Line(A, B)