Fourier series

i really need help for this question plz do help me. Solve it for me

That isn't how this forum works, which you definitely already know because you read the Read Before Posting thread, right? ;)

Please read the linked thread and comply with the rules found therewithin. Particularly, tell us what are your thoughts? And what have you tried? Share with us all of the work you've done on this problem, even the parts you know for sure are wrong. Thank you.
 
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