title: Why won't Maple evaluate this integral?
body: <pre><code>restart;
  assume(alph&gt;0);
  assume(alph,real);
  f_exp:=exp(-alph*r^2);
  ff_deriv:=simplify(r^2*f_exp^2);
  ff:=simplify(int(ff_deriv,r=0..infinity));
  </code></pre>
  
  <p>It seems to understand what I'm trying to integrate but when I try and find ff it comes up with an awful expression full of erf functions and with a <code>lim r--&gt; infinity</code> at the front. However on wolfram alpha I get the answer that I want:<code>sqrt(pi/2)/(8*alpha^(3/2))</code>.</p>
  
  <p>Can anyone help me with this? </p>
  
  <p>Thank you so much!</p>