Question: In Exercises 1-4, factor the expression. Use the fundamental identities to simplify, if necessary. (There is more than one correct form of each answer.) 1.

In Exercises 1-4, factor the expression. Use the fundamental identities to simplify, if necessary. (There is more than one correct form of each answer.)
1. sec2 x - 1 / sec x - 1
2. cos x - 2 / cos2 x - 4
3. 1 - 2 cos2 x + cos4 x
4. sec4 x - tan4 x

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