[obm-l] Recorrência

To: obm-l@xxxxxxxxxxxxxx
Subject: [obm-l] Recorrência
From: Júnior <jssouza1@xxxxxxxxx>
Date: Sat, 1 Oct 2005 00:42:43 -0300
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Alguém poderia resolver essa recorrência ?
a_n = 2(cos b)a_n-1 - a_n-2 , para n >= 3 , a_1=cos b , a_2 = cos 2b

Júnior.