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

[Torsten Bronger]

Hallöchen!

Eli Zaretskii writes:

>> From: Torsten Bronger <bronger@physik.rwth-aachen.de>
>> Date: Wed, 8 Feb 2017 08:37:57 +0100
>> 
>> 
>> In Emacs calc usind degree mode, cos(1) results in 0.540302305868
>> instead of 0.999847695156.
>
> Are you sure you were in degree mode?

Absolutely.  And funny enough, cos(90) resulted in zero(!).  For the
whole time, Deg was in the modeline, and I didn't switch anything.
Also with "emacs -q".  The sequence "m d 90 C 1 C m r 90 C 1 C"
yields:

0
0.540302305868
-0.448073616129
0.540302305868

Tschö,
Torsten.

-- 
Torsten Bronger