and i dont understand this at all!(Thinking)

can you explain this one?

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- May 19th 2008, 09:12 PMsingleton2787trigonometric identities
and i dont understand this at all!(Thinking)

can you explain this one?

- May 19th 2008, 09:21 PMChris L T521
This problems requires that you know about even/odd functions.

A function is**even**if , and a function is**odd**if .

Let's apply this to trig:

implies that cosine is an even function.

implies that sine is an odd function.

Thus, we can rewrite our expression as:

Hope this helped you out! :D - May 19th 2008, 09:32 PMsingleton2787question
alright thanks that helped a lot

but i dont understand how you got from here....

to here...

how did you get in the bottom of the second fraction? - May 19th 2008, 10:25 PMChris L T521