bug#25652: 26.0.50; calc says that cos(1 degree) is 0.54

[npostavs]

tags 25652 confirmed
retitle 25652 26.0.50; [calc] In Units Simplication + Degree mode cos(1 deg) != 
cos(1)
quit

Torsten Bronger <bronger@physik.rwth-aachen.de> writes:
>> You can toggle this in calc mode with "m U".  So "m d m U 1 C m U
>> 1 C" should exhibit the problem.  Note that you have "Deg" active
>> the whole time.  [...]
>
> After havin updated to current git master, I can now reproduce this
> on both of my machine.  Can you confirm?

Yes, this happens in units simplication mode.  Note that 'cos(1 deg) RET
does give 0.999.  It seems to be because of the fix for #23889 [1:
713e922243].  Tino, any ideas?

1: 2016-07-12 00:38:14 +0900 713e922243fb60d850f7b0ff83f3e2a3682f1832
  Ignore angle mode while simplifying units