title: Python -the integral from function multiplication
body: <p>In python, I have two functions <code>f1(x)</code> and <code>f2(x)</code> returning a number. I would like to calculate a definite integral after their multiplication, i.e., something like:</p>
  
  <pre class="lang-py prettyprint-override"><code>scipy.integrate.quad(f1*f2, 0, 1)
  </code></pre>
  
  <p>What is the best way to do it? Is it even possible in python?</p>