f: y = ((-0.5 * 9.8) * x^(2) / ((25 * cos(70°)^(2)))) + (tan(70°) * x)
M = Point(f)
tangente = Tangent(M, f)
t = 0.65 (slider from 0 to 1, step 0.05)
XA: (1.71 * t)
YA: (-4.9 * t^(2)) + (4.7 * t)
A: (XA, YA)
XB: (1.71 * (t + 0.1))
YB: (-4.9 * (t + 0.1)^(2)) + (4.7 * (t + 0.1))
B: (XB, YB)
DroiteAB = Line(A, B)
XC: (1.71 * (t - 0.1))
YC: (-4.9 * (t - 0.1)^(2)) + (4.7 * (t - 0.1))
C: (XC, YC)
DroiteBC = Line(B, C)