I have a question about the rage ability. Can a creature sneak attack while in a rage?
Can a creature use CMB while raging (to trip in particular)?
Can a creature use combat expertise while raging?
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While in rage, a barbarian cannot use any Charisma-, Dexterity-, or Intelligence-based skills (except Acrobatics, Fly, Intimidate, and Ride) or any ability that requires patience or concentration.
None of the abilities you listed require "patience" (read: multiple rounds to activate) or "concentration" (read: can be interrupted by distraction). As a DM I might listen to the argument that Combat Expertise requires Intelligence as a prerequisite and thus requires concentration, but I would be inclined to rule that is not how the rule reads.
Examples of things that would not work would be:
Spellcasting - requires concentration.
Assassin death attack - requires patience.
I have a question about the rage ability. Can a creature sneak attack while in a rage?
Most likely not, but it might depend on the DMs interpretation of "requiring patience and concentration"
Can a creature use CMB while raging (to trip in particular)?
I don't see why not, but again, it might be a DM call.
Can a creature use combat expertise while raging?
There's nothing that explicitly disallows it, like the others, but that patience and concentration line is just vague enough to make it less than a 100% chance that you can use it.