I'm trying to learn how to do trig identies and these questions are confusing me. Could someone show me step for step how to do these, please. Besides the identies is there any rule on how to do it? Plz and thk-u

1. 1+ 1\tan(squared)x = 1\sin(squared)x

2. 2sin(squared)x - 1= sin(squared)x - cos(squared)x

3. 1\ 1- sin(squared)x = 1 + tan(squared)x

4. cos(squared)x - sin(squared)x = 2cos(squared)x - 1

You don't have to do all of them although I'd really appericate if you did. Thanks