title: How to pretty print in ipython notebook via sympy?
body: <p>I tried <code>pprint</code>, <code>print</code>, the former only prints Unicode version, and the latter doesn't do pretty prints. </p>
  
  <pre><code>from sympy import symbols, Function
  import sympy.functions as sym
  from sympy import init_printing
  init_printing(use_latex=True)
  from sympy import pprint
  from sympy import Symbol
  
  x = Symbol('x')
  
  # If a cell contains only the following, it will render perfectly.
  (pi + x)**2
  
  # However I would like to control what to print in a function, 
  # so that multiple expressions can be printed from a single notebook cell.
  pprint((pi + x)**2)
  </code></pre>