**Notice:** This post was updated on March 10, 2015 to reflect a correction in the Trigonometric Identities image. The accompanying Google Document was also corrected, as was the link to that Document. If you downloaded the Google Document before 03/10/2015, please re-visit this link and download the new version. Thank you, and sorry for the inconvenience.
CLICK HERE to view the YouTube video that corresponds to this post.
Identity problems are probably the toughest part of Trigonometry for most people. They can look scary and huge and daunting, and many students become overwhelmed at just the sight of them. I hope that this post will make you less fearful of identity problems.
The first thing to address is that you need to know the trig identities. Just knowing these will make the problems half as challenging. The best way to learn them is to use them. Have a sheet with all of the identities listed (so that you don't have to flip through your book) and use this sheet only when you need it. If you think you know the identity to use, go ahead and use it and see what you get. Use your "cheat sheet" as a safety net, not as a life preserver.