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 )