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Res: [obm-l] Trigonometria

To: obm-l@xxxxxxxxxxxxxx
Subject: Res: [obm-l] Trigonometria
From: Danilo Nascimento <souza_danilo@xxxxxxxxxxxx>
Date: Mon, 19 Feb 2007 13:56:59 -0800 (PST)
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Use que tan(60-x)*tanx*tan(60+x)=tan3x.

faça x=10 e use que tanx=1/tan(90-x).

[]'s

----- Mensagem original ----
De: Graciliano Antonio Damazo <bissa_damazo@yahoo.com.br>
Para: obm-l@mat.puc-rio.br
Enviadas: Segunda-feira, 19 de Fevereiro de 2007 3:21:37
Assunto: [obm-l] Trigonometria

Alguem poderia me ajudar?

prove que: tg20º.tg30º.tg40º = tg10º

Obrigado por enquanto...

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