texting maxima (continued)



The same results were given by Maxima 5.4:

[daniel@georgette ~]$ maxima
GCL (GNU Common Lisp)  Version(2.3) ven avr 28 22:31:35 CEST 2000
Licensed under GNU Library General Public License
Contains Enhancements by W. Schelter
Maxima 5.4 ven avr 28 22:31:31 CEST 2000 (with enhancements by W. Schelter).
Licensed under the GNU Public License (see file COPYING)
(C1) integrate(1/(1+x+x^5),x);

             /  2
             [ x  - 4 x + 5
             I ------------ dx                            2 x + 1
             ]  3    2                2            5 ATAN(-------)
             / x  - x  + 1       LOG(x  + x + 1)          SQRT(3)
(D1)         ----------------- - --------------- + ---------------
                     7                 14             7 SQRT(3)
(C2) 

The true answer is (given for example by MuPAD 1.4.2):


   *----*    MuPAD 1.4.2 -- The Open Computer Algebra System
  /|   /|
 *----* |    Copyright (c)  1997 - 1999  by SciFace Software
 | *--|-*                   All rights reserved.
 |/   |/
 *----*      Licensed to:   Daniel Duparc
                                                                
 Type ?demo, ?topics, ?news or ?changes for further information.


>> int(1/(1+x+x^5),x);

           /    1/2           \
   1/2     | 2 3    (x + 1/2) |
5 3    atan| ---------------- |               2             /
           \        3         /   ln((x + 1/2)  + 3/4)      |
------------------------------- - -------------------- + sum|
              21                           14               \

        /                      2           3            4
        |     5941 X2   3284 X2    54096 X2    216384 X2
   X2 ln| x + ------- - -------- + --------- - ---------- +
        \       625       625         625         625

           \                                               \
           |                             2         3       |
   256/625 |, X2 = RootOf(- 12 X3 - 23 X3  + 161 X3  - 1 ) |
           /                                               /

Bests regards.
----
Daniel Duparc <dduparc@club-internet.fr>
29 av. de la Commune de Paris
94400 Vitry sur Seine (France)