Solution 12288: Inverse Function on the TI-34 II Explorer Plus™.
Where is the inverse function on the TI-34 II Explorer Plus?
On the TI-34 II Explorer Plus calculator, the [x-1] key is used to calculate the inverse (or reciprocal) of a value. The [x-1] function is accessed by pressing [2nd] [EE].
Please refer to the example provided below.
Example: Find the inverse of 3.
1) Press  [2nd] [EE] [=].
The displayed result of 0.33333333 will be displayed.
Please see the TI-34 II Explorer Plus guidebooks for additional information.