## [Maxima-bugs] [ maxima-Bugs-3544336 ] Trigonometric Simplification to SINE function

 [Maxima-bugs] [ maxima-Bugs-3544336 ] Trigonometric Simplification to SINE function From: SourceForge.net - 2012-07-16 04:16:26 ```Bugs item #3544336, was opened at 2012-07-15 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: 2012-07-15 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 ```

 [Maxima-bugs] [ maxima-Bugs-3544336 ] Trigonometric Simplification to SINE function From: SourceForge.net - 2012-07-15 11:05:53 ```Bugs item #3544336, was opened at 2012-07-15 04:05 Message generated for change (Tracker Item Submitted) made by 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) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=104933&aid=3544336&group_id=4933 ```
 [Maxima-bugs] [ maxima-Bugs-3544336 ] Trigonometric Simplification to SINE function From: SourceForge.net - 2012-07-16 04:16:26 ```Bugs item #3544336, was opened at 2012-07-15 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: 2012-07-15 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 ```