title: Python Calculation Using List
body: <p>How can I perform calculations in python using two lists? Where the first calculation would be, c = -(1)/cos(4), second being, c = -(5)/cos(6), etc</p>
  
  <pre><code>import numpy as np
  x, y = [1,5,2,1], [4,6,2,3]
  
  c = []
  c = -x/(np.cos(y))
  print(c)
  </code></pre>
  
  <p>When I try this I currently get the error : </p>
  
  <pre><code>TypeError: bad operand type for unary -: 'list'             
  </code></pre>