omg I hate these things...
1. sin^4A + 2cos^2A - cos^4A = 1
2. cos3A = -3cosA+4cos^3A
3. cos^4A = 1/8(3 + 4cos2A + cos4A)
4. (1 - cosA)/sinA = tan(A/2)
5. sin2A = (2tanA)/1 + tan^2A
Well, these are all of them so far, because I haven't looked at them all yet. Trust me I tried to do these by myself, and succeded in some not on here, but I'm not an identities person.