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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.fortran
Subject: Re: Angle Units For Trig Functions
Date: Wed, 23 Oct 2024 00:57:23 -0000 (UTC)
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On Tue, 22 Oct 2024 18:14:14 -0600, Louis Krupp wrote:

> On 10/21/2024 10:26 PM, Lawrence D'Oliveiro wrote:
>
>> On Sun, 20 Oct 2024 05:35:25 -0000 (UTC), Steven G. Kargl wrote:
>>
>>> % gfcx -o z a.f90 && ./z 0.500000000      0.500089288
>>>
>>> One of these values is exact, and one of these raises FE_INEXACT.
>>
>> Does it work for 29° and 31° as well? What’s so special about 30°?
> 
> https://en.wikipedia.org/wiki/Niven%27s_theorem

So a whole set of extra functions, just to get a nice result for one 
value?