title: IPython sympy math pretty print doesn't work
body: <p>I am trying to print a scipy result with pretty print but it seems output not in latex format.</p>
  
  <pre><code>import sympy
  from sympy import *
  
  init_printing() 
  
  var('x,y')
  y = sympy.expand((x+y)**2)
  y
  </code></pre>
  
  <p>Output:</p>
  
  <p><a href="https://i.stack.imgur.com/k7Fqim.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/k7Fqim.png" alt="enter image description here"></a></p>