Computing definite Integrals using the 1. Fundamental Theorem of Calculus can be achieved using Calculus Made Easy at https://www.tinspireapps.com/?a=CME
Use option 8 in the INTEGRATION menu
Enter function f(x) and bounds [a,b] as shown below
View the Integration steps, here, the Power Rule is applied.
Lastly, plug the bounds into the above Antiderivative, subtract and that’s it!