Does anyone have a good website that shows the proofs for these equations?

Question

sin(u+v) = sin(u)cos(v) + sin(v)cos(u)
cos(u+v) = cos(u)cos(v) + sin(v)sin(u)

Thanks!

Answer 1

http://www.youtube.com/watch?v=zw0waJCEc-w

http://www.youtube.com/watch?v=V3-xCPDzQ1Q