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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.fortran
Subject: Re: Angle Units For Trig Functions
Date: Thu, 24 Oct 2024 04:47:06 -0000 (UTC)
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On Thu, 24 Oct 2024 02:17:15 -0000 (UTC), Steven G. Kargl wrote:

> One of these values is wrong.

Only if you assume the input numbers were somehow “exact” or “perfect” to 
begin with.

There’s an old principle in computing: “Garbage In, Garbage Out”.

> You seem to be missing that argument reduction for sind(x)
> is much easier than argument reduction for sin(x).

But that only worked for one angle, and for nothing else.