Solving Puzzling Math Problem: Bracketed Term = 0

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Please see the attachment

Can anyone tell me why the bracketed term = 0 if c does not equal and integer multiple of q/r ...

Thanks :(
 

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Think of it as an integral over a sine or cosine function. If it is not an integral number of periods, then the integral(sum) averages to zero.
 
Hi,

can you provide some more indept info ? Were there any boundary-conditions given ?

I can't really find any solution to your problem based upon these data?

Can you post the entire display of this formula and how it is constructed?


regards
marlon
 

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