title: How do I compute derivative using Numpy?
body: <p>How do I calculate the derivative of a function, for example </p>
  
  <blockquote>
    <p>y = x<sup>2</sup>+1 </p>
  </blockquote>
  
  <p>using <code>numpy</code>?</p>
  
  <p>Let's say, I want the value of derivative at x = 5... </p>