a = 1.5 (slider from 0 to 3, step 0.1)
f(x) = 1 / 10 x^(3) + 1 / 5 x^(2) - 3 / 2 x
p(x) = 2 / 15 x^(2) + 2 / 3 x
g(x) = -3 / 2 x - 2
P1 = Point(f)
t = Tangent(P1, f)
a_2 = 1.4
g2: x = a
A = Intersect(f, g2, 1)
B = Intersect(p, g2, 1)
C = Intersect(f, xAxis, 3)
poly1, c, a_1, b = Polygon(A, B, C)