title: Render a sympy expression literally, with no simplification
body: <p>I wonder how I can make sympy behave such that the expression is rendered literally and no defactoring occurs (4 under the sqrt)</p>
  
  <pre><code>from sympy import init_session
  init_session(quiet=true)
  from sympy.interactive import printing
  printing.init_printing(use_latex=True)
  a=sqrt(4*A**2*Z**2)
  a
  </code></pre>
  
  <p>gives</p>
  
  <pre><code>2 * sqrt(a**2*Z**2)
  </code></pre>
  
  <p>I'd rather would have it written as initially written (in the course of an educational text). So how does one prevent sympy from doing any simplifications or resolving?</p>