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I am unsure how to do this problem... i find problems where i have to derive things quite difficult! :P

http://img143.imageshack.us/img143/744/picture2ao8.png [Broken]

this is the Full Fourier series i think and so the Fourier coeffiecients would be given by:

http://img144.imageshack.us/img144/8200/picture5yv4.png [Broken]

ok so first i need to take the inner product, so i did this:

http://img99.imageshack.us/img99/7193/picture4ol9.png [Broken]

but then i am stuck... anyone got an idea of how to proceed from here?

Cheers! :)

Sarah

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# Homework Help: Fourier series: Parseval's identity HELP!

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