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It all depends on how you calculate gear life currently. If you rely on the std AGMA Strength Formulas, COSMOSWorks stress data isn't going to help you much. If you have a non-standard gear form or use a non-AGMA method based on measured or classically calculated stresses, COSMOSWorks can automate portions of that but you'll still need to calculate life manually.
I wouldn't recommend using the Fatigue study in COSMOSWorks Pro for gear life predictions unless you have a really odd tooth profile. There are more gear-specific methods that take into accound hardness and surface treatment for std gears.