- x0, a real number greater than 0
- I, a numerical estimate of the integral
I = | cosh(x) / sqrt(cosh(x0) - cosh(x)) dx
x0=1.0 --> I = 2.6405789412796
- Aim at a relative precision better than 1e-10
- The problem arises studying the frictionless movement of a mass point on a hanging wire, which follows the curve cosh(x).