Location of proofs of trigonometric identities

[michaelknight]

Where would be the best place to find every trigonometric identity, from sin[2] + cos[2] = 1, to the matrix identities (and Euler's equation would be helpful, also)

Also the location of mathematical analysis symbols would be helpful, also. Thank you very much in advance :)

 

[mathman]

Have you tried Google?

 

[Chirag B]

Have you tried Google?

LOL. And for the poster who asked—you could try Wikipedia. I've heard that it has quite a bit of formulas as well as their proofs.

…or you could always by a Trigonometry (Trigonometry only!) textbook online. I'll bet there's a decent one that covers everything from the basics to advanced concepts.