From: SourceForge.net <noreply@so...>  20120716 04:16:26

Bugs item #3544336, was opened at 20120715 04:05 Message generated for change (Comment added) made by macrakis You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3544336&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: https://www.google.com/accounts () Assigned to: Nobody/Anonymous (nobody) Summary: Trigonometric Simplification to SINE function Initial Comment: Hi This is a wish list of easy changes in Trigonometric Simplification to SINE function but they could be extended to other functions as well. 1) The trigonometric simplification should be aware that SIN(3*%PI/7)=SIN(4*%PI/7) or in general SIN(%PI* a/c)=SIN(%PI *b/c) where a+b=c. (a,b,c > 0) 2) The trigonometric simplification should simplify SIN(%PI*494/7) to SIN(%PI*(70+4))=SIN(%PI*4/7)  >Comment By: Stavros Macrakis (macrakis) Date: 20120715 21:16 Message: Thanks for the suggestions  both helpful. As a workaround until this is improved, note that trigrat( sin(4*%pi/7)  sin(3*%pi/7) ) => 0 and trigrat( sin(494*%pi/7)  sin(4*%pi/7) ) => 0  You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3544336&group_id=4933 