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From: "Steven G. Kargl" <sgk@REMOVEtroutmask.apl.washington.edu>
Newsgroups: comp.lang.fortran
Subject: Re: Angle Units For Trig Functions
Date: Wed, 23 Oct 2024 14:38:17 -0000 (UTC)
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On Wed, 23 Oct 2024 06:25:02 +0000, Lawrence D'Oliveiro wrote:

> On Wed, 23 Oct 2024 07:59:24 +0200, R Daneel Olivaw wrote:
> 
>> Lawrence D'Oliveiro wrote:
>>
>>> On Wed, 23 Oct 2024 04:06:26 -0000 (UTC), David Jones wrote:
>>> 
>>>> Did you take a high school trigonometry class?
>>> 
>>> You seem obsessed with that.
> 
> So your favourite functions return an exact result for sin 30°. Do they 
> return an exact result for cos 30° as well?
> 

Nope.  For REAL x, COSD(x) returns an exact result for all N >= 0
that satisfies 60+N*360 < 2**23.

-- 
steve