[obm-l] identidade trigon.

To: obm-l@xxxxxxxxxxxxxx
Subject: [obm-l] identidade trigon.
From: Júnior <jssouza1@xxxxxxxxx>
Date: Mon, 5 Sep 2005 11:00:14 -0300
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Sendo tg^2(a/2) = tg^2(b/2) tg^2(c/2) , mostre que se tem a igualdade cos(a)-cos(b)-cos(c)+cos(a)cos(b)cos(c)=0

Júnior.