To evaluate an indefinite integral on the TI89, press (F3  Calc menu) and select "2: ( integrate", or you can press . 

The screen shot at left shows a solution for Example 5, page 345 of the Larsen text. Note that the syntax of the integrate function is "expression, variable". 

To get the calculator to "tack on" the mandatory "+ C", you can add a third parameter to the function, as shown at right. 
