Thread: Fundamental Trigonometric Identities - Help Needed

Need help with the following questions, please.

http://img233.imageshack.us/img233/8...8150900wg0.jpg
http://img233.imageshack.us/img233/7...8150901eb4.jpg
http://img233.imageshack.us/img233/9...8151000zv4.jpg

Not sure how to start these.

Thank you.

Some of this might help ...

Trigonometric Identities - Proofwiki.org

Originally Posted by Untitled7

Need help with the following questions, please.

http://img233.imageshack.us/img233/8...8150900wg0.jpg
http://img233.imageshack.us/img233/7...8150901eb4.jpg
http://img233.imageshack.us/img233/9...8151000zv4.jpg

Not sure how to start these.

Thank you.

Ok, the best general advice I can give you on these kinds of problems is to know all of the basic identities cold so you can better see what will work where. For instance, on number 3, do you see how you can use this identity?