import numpy as np

x = np.linspace(0, 2, 20)
x = np.linspace(0, 2, 1000)

#y = x*(2 - x)
y = np.cos(18*np.pi*x)

import matplotlib.pyplot as plt
plt.plot(x, y)
plt.show()

"""
Terminal> python judge_plot.py
(output is a plot)
"""