October 12th, 2011, 05:03 PM  #1 
Newbie Joined: Oct 2011 Posts: 21 Thanks: 0  trig identities
Hello I'm having trouble with trig identities. Here is an example problem. (Csx+cotx) (1cosx) Haven't done these for a while. What do I do? 
October 12th, 2011, 05:42 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,193 Thanks: 504 Math Focus: Calculus/ODEs  Re: trig identities
We are given: Express the first factor in terms of sine and cosine: 
October 12th, 2011, 05:48 PM  #3 
Newbie Joined: Oct 2011 Posts: 21 Thanks: 0  Re: trig identities
Thanks man! All of that makes sense except how does 1 happen in 1cos^2x?

October 12th, 2011, 05:57 PM  #4 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,193 Thanks: 504 Math Focus: Calculus/ODEs  Re: trig identities
It's a difference of squares: Where in our case and . 

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