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Yeah, I went over it more indepth today with my teacher 'cause I told her I didn't understand much. She was really nice about it and I believe that I am actually starting to remember several of these identities. Thanks for your guys' help as well though, wouldn't have been able to do my homework that night without it.
Doulbe angle identities are created by using the sum identiy's where both angles are the same. So instead of "sin(A+B)" you use "sin(B+B)" or 2b: Double the angle. You then replace B everywhere with A.
Those two imply each other, and they also imply:
Can someone tell me the pythagorean identites that are used for trig?