[Maxima-discuss] How do I "unquote" 'integrate(cos(y),y) ?

[Eduardo O. <edu...@gm...>]

Hi list,

I'm trying to write code that will solve some basic problems of
integration by change of variables "step by step"... my first example
starts with:

  ex0 : 'integrate((3*cos(2 + sqrt(3*x+4))) / (2*sqrt(3*x+4)), x);
  ex1 :  integrate((3*cos(2 + sqrt(3*x+4))) / (2*sqrt(3*x+4)), x);
  ex2 : changevar(ex0, u=3*x, u, x);
  ex3 : changevar(ex2, v=u+4, v, u);
  assume(w>0);
  ex4 : changevar(ex3, w=sqrt(v), w, v);
  ex5 : changevar(ex4, y=2+w, y, w);
  display2d : false;
  ex5 ;

but how do I make Maxima integrate ex5? Its value is:

  'integrate(cos(y),y)

I know how to use the quote to make Maxima _avoid solving_ an integral
- see ex0 and ex1 above - but how do I maka Maxima solve the integral
in ex5? I made several attempts using ev, simp:true, and quote-quote,
but none of them worked...

  Thanks in advance!
    Eduardo Ochs
    http://angg.twu.net/eev-maxima.html