[Maxima-bugs] [ maxima-Bugs-2789110 ] solve, tan and atan depend on order of variables

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Bugs item #2789110, was opened at 2009-05-08 18:40
Message generated for change (Comment added) made by hlitzroth
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Category: Lisp Core - Solving equations
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: solve, tan and atan depend on order of variables

Initial Comment:
solve(tan(x - atan(c1/c2)) = 0, x); returns [x=atan(c1/c2)] corretly, 
but
solve(tan(x - atan(c2/c1)) = 0, x); returns [ ].

-------------------------------------------------------------
Maxima version: 5.18.1
Maxima build date: 14:34 4/18/2009
host type: i686-apple-darwin8.11.1
lisp-implementation-type: CMU Common Lisp
lisp-implementation-version: 19f (19F)
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Comment By: Harry Litzroth (hlitzroth)
Date: 2009-05-13 22:55

Message:
I use wxMaxima 0.8.2 with Maxima 5.18.1.

The same problem exists with

vg1 : tan(x - atan(y/z))= 0;
solve(vg1, x);

giving the solution -tan(atan(y/z)-x)=0,

and

vg2 : tan(x - atan(z/y)) =  0;
solve(vg2, x);

giving no solution at all.

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Comment By: Nobody/Anonymous (nobody)
Date: 2009-05-12 07:58

Message:
Both give the same result: []

-------------------------------------------------------------
Maxima version: 5.18.1
Maxima build date: 20:57 4/19/2009
host type: i686-pc-mingw32
lisp-implementation-type: GNU Common Lisp (GCL)
lisp-implementation-version: GCL 2.6.8
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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2789110&group_id=4933