Francois Maltey <[EMAIL PROTECTED]> writes: > Hello everybody ! Hans, Bill and others... > > > I am struggling with dealing with Expressions. For most sake and purposes I > > can find a fix and solve my small problems, but I never feel very assured. > > I have the same problem when I try to expand cos(2*x) in cos(x)^2-sin(x)^2. > > The expand(cos(x+y)) is right, but expand (cos(2*x)) remains cos(2*x). > > Martin and Bill help me, but I can't see the pretty way to write > my own expand which also compute for cos(2*x).
I believe that the "correct" way to do this is to patch the existing domains. You did not respond to http://lists.nongnu.org/archive/html/axiom-developer/2005-06/msg00294.html so I thought that you managed to get the results you wanted. Are you able to program in SPAD or Aldor already? I can help, if necessary. Maybe you could find out where the code for Chebyshev expansion should be inserted, possibly using the )trace facility - also described on MathAction: look at DebuggingAxiom. WE NEED MORE ALGEBRA DEVELOPERS! Martin _______________________________________________ Axiom-developer mailing list Axiom-developer@nongnu.org http://lists.nongnu.org/mailman/listinfo/axiom-developer
