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Slim is correct.
A readied action is a standard attack action.
An AOO is a single melee attack that exists outside a standard action. Even if an AOO is triggered during your standard action, the AOO interrupts your standard action with your free attack, and then you resume your standard action.
They are separate actions that will never intersect.

Xenrac |
You could work your way into Greater Trip then ready a trip attack and have both, on two separate attacks. Because they can't stack.