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From: "David Jones" <dajhawkxx@nowherel.com>
Newsgroups: comp.lang.fortran
Subject: Re: Angle Units For Trig Functions
Date: Wed, 23 Oct 2024 04:06:26 -0000 (UTC)
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Lawrence D'Oliveiro wrote:

> 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?

Did you take a high school trigonometry class?