# -*- coding: utf-8 -*-
"""
Created on Mon Feb 23 16:31:36 2026

@author: François Coulombeau
"""
import numpy as np
import matplotlib.pyplot as plt

X = np.linspace(0,0.9999,5000)
Y = X*np.sin(1/(1-X))

plt.plot(X,Y)
plt.plot(X,X,":")
plt.plot(X,-X,":")