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[obm-l] cos de racional

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Subject: [obm-l] cos de racional
From: Ricardo Bittencourt <ricbit@xxxxxxxxxxxx>
Date: Fri, 09 Feb 2007 15:24:08 -0300
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Além de cos 0=1, existe outro cosseno de racional cujo resultado é 
racional?

--
Ricardo Bittencourt
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