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posted by  mander08 on 5/21/2008 1:18:04 PM  |  status: Live  

NEED Help with Trig Identities *PLEASE - WILL RATE LIFESAVER*

Course Textbook Chapter Problem
Precalculus N/A 6 N/A
Question Details:
Find the exact value of the expression
 
cos ( 2 cos -1 4/5)
 
Any help is helpful!!!
Thanks = )

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posted by gongalla on 5/21/2008 1:34:57 PM  |  status: Live
Asker's Rating: Lifesaver   
mander08's comment:
"Thank you so much!!"
Response Details:
 
 
     put
                                              
= cos 2p
                                 = 2
                                 = 2
                                
Hope this will help U
 
 
Tags: Math, Precalculus
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