How to calculate the following? when f(x) = the ...

How to calculate the following?
when f(x) =
the term after the summation is sin(nx)/n^2 where n^2 is nsquared. I need to learn to handle this equation editor :)
My problem is not so mutch the integration rules. I'm just notsure how you are allowed to integrate over a summation. Can I justleave in the summation?
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    Answers ( 3 )

    1. mar ortiz
      mar ortiz
      Usually, integration over a summation is carried out by simplymoving the integal sign inside the summation sign.
    2. lea jørgensen
      lea jørgensen
      No problem
    3. camille ennis
      camille ennis
      Thank you!

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