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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 05:22:53 -0000 (UTC)
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On Thu, 24 Oct 2024 05:06:37 -0000 (UTC), Steven G. Kargl wrote:

> For sin(x), argument reduction will give sin(0) = 0, exactly. That's one
> angle.

More generally, it gives sin(x) ≃ x, for uncountably many angles.

> For sind(x), argument reduction will give sind(x) = 0, exactly,
> for countable many angles.

But it never gives sind(x) anywhere close to x.