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From: Yeechang Lee <ylee@pobox.com>
Newsgroups: comp.misc
Subject: Re: Calculator Accuracy
Date: Fri, 25 Jul 2014 20:26:25 -0700
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Gordon Henderson wrote:
> Put calculator into degrees mode, enter 45, then push SIN, COS, TAN,
> then the inverses - INV-TAN, INV-COS and INV-SIN - then subtract 45 and
> see what the result is.

The OS X 10.9 calculator returns -0.00000000016136, which is close
enough to zero for our purposes.

A calculator for the OS X Dashboard returns 0, which of course could
be rounding.

Orpie for various Unixes returns 5.698552740796e-12.