Les paraboles
Author: Antony Marion
Date: 09/04/05

\ f(x)=a(x-b)^2+c

a = 0.29300000000000015 (slider from -4 to 4, step 0.0010)
b = 0.20000000000000107 (slider from -10 to 10, step 0.1)
c = 1.8000000000000007 (slider from -10 to 10, step 0.1)
Cf: y = a (x - b)^(2) + c
A = Point(xAxis)
B = Point(xAxis)
i = Vector(A, B)
C = Point(yAxis)
j = Vector(A, C)