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From: ljdickey@watmath.UUCP (Lee Dickey)
Newsgroups: net.math
Subject: Re: math identity
Message-ID: <8603@watmath.UUCP>
Date: Fri, 10-Aug-84 10:40:59 EDT
Article-I.D.: watmath.8603
Posted: Fri Aug 10 10:40:59 1984
Date-Received: Sat, 11-Aug-84 00:15:16 EDT
References: <261@tymix.UUCP> <266@tymix.UUCP>, <8601@watmath.UUCP>
Organization: U of Waterloo, Ontario
Lines: 10

> The following assertion was found in the curiosity column of a magazine
> addressed to mathematics instructors:
> 
> 	tan(3*pi/11) + 4*sin(2*pi/11) = sqrt(11) exactly, but who
> 	cares?
> 
> Is the relation exact, or is it one of those extraordinary coincidences?

The relation is exact, and not too dificult to prove.  If you want the
proof, write to me.