The tutor shows the integral function on the TI-83 Plus.

To evaluate an integral on the TI-83 Plus, go to the Math menu, then arrow down to fnInt(, which is choice 9. It accepts the parameters as follows:

fnInt(function, variable of integration, lower bound, upper bound)

Therefore, to integrate xsinx from 1 to 2 (in rads), one would put

fnInt(xsin(x), x, 1, 2)

Hopefully one would receive the answer 1.4404:)

Source:

TI-83 Plus Graphing Calculator Guidebook. Texas Instruments, 1999.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.