# -*- coding: utf-8 -*-
"""
Created on Tue Oct 18 16:23:58 2022

@author: dsaby
"""

import numpy as np
import matplotlib.pyplot as plt

t=np.linspace(0,4*np.pi,1000)
e = 2*np.sin(np.pi*t)+0.9*np.sin(np.pi*10*t)+0.5*np.sin(np.pi*30*t)

plt.plot(t,e)
plt.show()