trig identities - Sal is sloppy but he does explain it well - there are even 2 more parts to this.
https://www.youtube.com/watch?v=OLzXqIqZZz0&list=PLD6DA74C1DBF770E7&index=13
Establishing Identities - hard to find a good one but these seem fine
https://www.youtube.com/watch?v=QGk8sYck_ZI
https://www.youtube.com/watch?v=ep5vjIY5kqE
solving equations This guy is very neat and explains reference angles patiently
https://www.youtube.com/watch?v=IWeuFrtwXkY
Here is one about using factoring to solve.
https://www.youtube.com/watch?v=_gX1LOYpR8o
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