# 圓的漸伸線
# python code is as follows:
import numpy as np
import matplotlib.pyplot as plt
a=1
t = np.linspace(0,30,300)
x = a*(np.cos(t)+t*np.sin(t))
y= a*(np.sin(t)-t*np.cos(t))
plt.figure(figsize=(8,6))
plt.plot(x,y,color="red",linewidth=2)
plt.show()
# The output is as follows:
