wxMaxima 0.8.2 http://wxmaxima.sourceforge.net
Maxima 5.18.1 http://maxima.sourceforge.net
Using Lisp CLISP 2.46 (2008-07-02)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.

(%i61) display2d:false;
g:subst(-8,b,subst(2*%pi*1500,a,+sin(a*(x-4/2))*exp(b*(x-4/2)^2)+
  sin(a*(x-3/2))*exp(b*(x-3/2)^2)
  +sin(a*(x-2/2))*exp(b*(x-2/2)^2)));
display2d:true;
wxplot2d([g],[x,-1,5]);
g;