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# Import the module for plotting
# _*_ coding:utf-8 _*_
import numpy as np
import matplotlib.pyplot as plt
if __name__ == '__main__':
a = 1
t = np.linspace(-50, 50, num=1000)
p = a * (1 - np.cos(t))
x = p * np.sin(t)
y = p * np.cos(t)
plt.plot(x, y, 'r-', linewidth=0.5)
plt.grid()
plt.show()