text: import math
  import numpy as np
  import matplotlib.pyplot as plt
  
  def square(x):
      return x**2
  
  def exp_dec(x):
      return math.e ** (x/-8) * math.cos(x)
  
  x = []
  for loop in np.arange(-2, 2.1, .1):
      x.append(loop)
  
  y = [square(v) for v in x]
  
  plt.figure()
  plt.plot(x, y)
  plt.title("Square")
  # plt.y_lable("y")
  plt.show()
  