Mine took 28 seconds. The input wasIf you use the regular integration function, (), it will take longer since the calculator will first try to integrate the expression symbolically.Code:nInt(cos( (x)+x),x,0,60)

And this answers the question in your title: the TI-89 can do symbolic manipulation; the 84+ cannot. Personally, being able to do symbolic integration is much more important to me than having slightly faster numeric integration.