Python：使用matplotlib画三角曲线图

import numpy as np
import matplotlib.pyplot as plt

x=np.linspace(-10,10,1000)
a=np.sin(x)
b=np.cos(x)
c=np.tan(x)
d=np.log(x)

plt.figure(figsize=(8,4))
plt.plot(x,a,label='$sin(x)$',color='green',linewidth=0.5)
plt.plot(x,b,label='$cos(x)$',color='red',linewidth=0.5)
plt.plot(x,c,label='$tan(x)$',color='blue',linewidth=0.5)
plt.plot(x,d,label='$log(x)$',color='grey',linewidth=0.5)

plt.xlabel('Time(s)')
plt.ylabel('Volt')
plt.title('PyPlot')
plt.xlim(-10,10)
plt.ylim(-5,5)
plt.legend()
plt.show()