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Re: [obm-l] trigonometria



tg (9pi/4) = tg (pi/4) = 1
6x/pi = 1 => 6x = pi => 3x = pi/2, que tem cosseno igual a zero.
----- Original Message -----
Sent: Thursday, January 02, 2003 7:15 PM
Subject: [obm-l] trigonometria

Porque se a tg  (9pi/4)=6x/pi, então cos 3x é zero?