Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!hp4nl!charon!jurjen
From: jurjen@cwi.nl (Jurjen NE Bos)
Newsgroups: comp.arch
Subject: Re: sin(pi) (Was: Re: bizarre instructions)
Message-ID: <3030@charon.cwi.nl>
Date: 26 Feb 91 15:30:50 GMT
References: <KHB.91Feb21102723@chiba.Eng.Sun.COM> <15485@lanl.gov> <3028@charon.cwi.nl>
Sender: news@cwi.nl
Lines: 11

jurjen@cwi.nl (Jurjen NE Bos) writes:

>People owning a HP28 or HP48 know this.  This calculator indeed delivers 0 for
>sin(pi), and 0.0548036651488 for sin(3.14159265359).  Note that the latter
>value is correct to 12 digits.

Oops.  I was asleep.
The correct value of sin(3.14159265359) in radians (not degrees!) is of course
-2.06761537357E-13.  The calculator uses 32-bit argument reduction, so that in
can compute 12-digit sine values up to 1E20.
I am embarrassed.


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