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October 12th, 2011, 05:03 PM   #1
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trig- identities

Hello I'm having trouble with trig identities.

Here is an example problem.

(Csx+cotx) (1-cosx)

Haven't done these for a while. What do I do?
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October 12th, 2011, 05:42 PM   #2
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Re: trig- identities

We are given:



Express the first factor in terms of sine and cosine:





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October 12th, 2011, 05:48 PM   #3
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Re: trig- identities

Thanks man! All of that makes sense except how does 1- happen in 1-cos^2x?
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October 12th, 2011, 05:57 PM   #4
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Re: trig- identities

It's a difference of squares:



Where in our case and .
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