Your bug report

#23889: 25.0.95; Calc; calc-simplify-units not working as documented for trigometric functions

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 23889@debbugs.gnu.org.

-- 
23889: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23889
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