Arithmetic mean and root means square using range variable as lower limit

[ttuomisto]

Hello. I am trying to draw two curves: the average voltage and the root mean square voltage in the function of x1. When x1 = 0..pi and x2 = pi.

I am running into problems when defining the lower limit of the integral since I can't seem to define it as a range variable.

Here is where I have got done:

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Thank you for your time. I really appreciate any help

[VladimirN]

Please attach your Mathcad worksheet.

[Werner_E]

You write fk(x):= but the right hand side is NOT DEPENDENT on x! x is the variable of integration.

Guess it should be f(x.1).

Any reason you want to vary the lower limit and not the upper one?

And as Vladimir already wrote - for future questions pleas post the worksheet, nut just the pic.

[Werner_E]

Maybe you are just looking for something like this?