Integration, also known as antidifferentiation, reverses the process of differentiation. Integration is useful in finding volumes. A TI89 Titanium is a powerful calculator developed by TI, or Texas Instruments. It can be used on the SAT I and SAT II as well as AP Statistics, Physics, Calculus and other exams, and it comes with review questions installed for the AP Calculus exam. It comtains three times the flash memory of the prior version of the TI89. The TI89 has the capability of integrating functions.

Press the "F3" button and press "2."

Enter in the equation you want to integrate then type "," at the end. For example, enter "∫(x^3,".

Specify the variable that you will be integrating. In the example, this would be "x", so we would have "∫(x^3,x".

Type ")" and press "ENTER," if the bounds of the interval are not known. In the example, this would be "∫(x^3,x)." If the upper and lower bounds are known, press "," and add in the lower bound, then upper bound in that order separated by a comma. Press the "ENTER" key. In the example, this would be "∫(x^3,x,1,3)" where 1 is the lower bound and 3 is the upper bound. To add the "+c" at the end, you would replace the upper and lower bound with "c." In the example, this would be "∫(x^3,x,c)."