import matplotlib.pyplot as plt
import numpy as np
x=np.linspace(0,15,200)
y=np.exp(-0.2*x)*np.sin(2*x)
plt.plot(x,y,color='green',label='y=f(x)=exp(-0.2x)sin(2x)')
y=np.exp(-0.2*(x-0.8))*np.sin(2*(x-0.8))
plt.grid(color='y')
plt.yticks([-1,-0.5,0.0,0.5],color='red')
plt.xticks(color='blue',rotation=-45)
plt.title(u'Затухающие колебания',color='fuchsia')
plt.plot(x,y,'r:',label='y=f(x-3.14159)')
plt.legend(loc='lower right',fontsize=11)
plt.show()