Question about CAS and Graphing

[Mysilmaril]

I just purchased my HP Prime and I'm learning how to use it. I have a question about working between the Function app and CAS. I'll use an example to explain my question:

Let's say you perform the following integration in CAS, int(x,x). The result is 1/2 * x^2. Now, let's say you want to plot the result as a function, f(X) using the Function app.

If I switch to the Function app, I can push the "Menu" button to get the result of my integration in CAS. However, I can't enter this equation because it uses a lower case 'x' instead of an upper case 'X'.

To plot the equation you have to swap out the 'x' with a 'X'. This isn't very efficient for larger equations. What's the point of getting an equation from CAS if you can't use it?

Maybe I'm missing something. Is there a better way to work between CAS and this app (or Home for that matter)?

Thanks.