February 9th, 2011, 07:43 AM  #1 
Member Joined: Oct 2010 Posts: 30 Thanks: 0  hard question on half range series
Could someone help me with the question in the attachment please, I really don't understand it!!

February 9th, 2011, 03:42 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,835 Thanks: 733  Re: hard question on half range series
Look up Parseval's theorem http://en.wikipedia.org/wiki/Parseval%27s_theorem Essentially it is a relationship between the L2 norm of a function and the l2 norm of its Fourier series. 

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