Inverse Functions – The Basics!

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Inverse Trigonometric Functions http://www.youtube.com/watch?v=bBBUMHe900U
All of the fundamental ideas of inverse functions are discussed. What exactly is an inverse function conceptually? Which functions have inverses? How do I graph inverse functions? What are the other basic relationships?
I do not actually show how to find an inverse (I thought the video was getting too long!). I also already have videos about how to find inverses, so I will provide a link somewhere!

Questions?