[WP-34S] My first integral on this calculator

[jebem]

Thanks for the corrections and optimizations, Didier!

My intention was to show my (hard) path to discover how to use the integrals in the WP-34S, as the existing documentation assumes people knows all this stuff already and so it doesn't include concrete examples of usage for integration, derivatives, matrices, etc.

Of course my stupid basic program is not the way to go... setting the variables hardcoded into the program... I did it that way just to test the integration mechanism.
When I have time, I will create a new one that will create the UI (user interface) similar to what the HP-42S is doing, asking to supply the values for the different variables in the formula.
Somehow I was expecting the WP-34S to be doing integration using similar UI as seen in the HP-42S, but no luck.