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NNTP-Posting-Date: Thu, 08 May 2014 04:55:46 -0500
From: David Hume <David.Hume@example.com>
Newsgroups: comp.misc
Subject: Re: Calculator Accuracy
References: <lkfa27$661$1@dont-email.me> <mtHav.235783$vM2.115843@fx18.am4>
Date: Thu, 08 May 2014 10:55:42 +0100
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Xref: csiph.com comp.misc:2688

"BartC" <bc@freeuk.com> writes:


> My Casio fx-83 gives 1.2702e-9 degrees (difference from the original 45
> degrees).
>
> (On this algebraic calculator it's entered as
> invsin(invcos(invtan(tan(cos(sin(45))))))-45.)

That sounds fun.

clisp:

(- (* (/ 180 pi) (asin (acos (atan (tan (cos (sin (* (/ pi 180) 45)))))))) 45)
-1.7347234759768070944L-17

We have a winner! :D