March 11th, 2011, 03:20 PM  #1 
Member Joined: Apr 2010 Posts: 46 Thanks: 1  Simple Trig
Simplify the following as much as possible: I get that the top simplifies to , but the bottom isn't pretty and I'm not sure what to do with it. Could anyone help me out? 
March 11th, 2011, 03:52 PM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Simple Trig Hello, clandarkfire! Quote: It helps if you know some multipleangle identities: [color=beige]. . / / / [/color] [color=beige]. . [/color] [color=beige]. . . . . . . . . . . . . . . . .[/color]  
March 11th, 2011, 05:32 PM  #3 
Member Joined: Apr 2010 Posts: 46 Thanks: 1  Re: Simple Trig
Thankyou! I got the numerator, but my method of finding cos3x gave me and somehow I didn't get that that was equal to 
March 12th, 2011, 02:51 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,931 Thanks: 2205 
If you can't find your mistakes, we can identify them if you post your work here.

March 12th, 2011, 05:14 PM  #5 
Senior Member Joined: Apr 2007 Posts: 2,140 Thanks: 0 
By using the right trigonometric identities, you should be able to arrive at the correct answer.


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