From: SourceForge.net <no...@so...> - 2010-08-10 16:23:15
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Bugs item #3030806, was opened at 2010-07-17 02:07 Message generated for change (Comment added) made by You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&group_id=4933 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Lisp Core - Trigonometry Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Nobody/Anonymous (nobody) Assigned to: Nobody/Anonymous (nobody) Summary: no exact result sin(%pi/12) Initial Comment: Maxima doesn't count exact result of sin(%pi/12) or cos(%pi/12), etc. despite the fact it's simple. It is (sqrt(3)-1)/2*sqrt(2) - or (in other form): (sqrt(6)-sqrt(2))/4. ---------------------------------------------------------------------- Comment By: https://www.google.com/accounts () Date: 2010-08-10 18:23 Message: There is also a problem in numerical evaluation of sin(%pi/6) and cos(%pi/3): (%i1) sin(%pi/6),numer; (%o1) .4999999999999999 (%i2) cos(%pi/3),numer; (%o2) .5000000000000001 Why aren't they 0.5? It is not a big error, but it should be fixed ---------------------------------------------------------------------- Comment By: Raymond Toy (rtoy) Date: 2010-07-17 04:16 Message: This is really a feature request, not a bug. Having said that, I have some code to handle this and other cases like %pi/3/2^m and %pi/5/2^m. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3030806&group_id=4933 |