texte1 = LaTeX(d, true, true)
x_M = 1.43 (slider from -5 to 5, step 0.01)
M: (x_M, x_M - 4)
A = (0, 1)
a = Segment(A, M)
texte2: "“La distance AM est égale à ”=" + a + ""
N: (x_M, a)