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Possible Duplicate:
Fourier 1st step?

How to find fourier transform of a series of the such form: $y_k=\left[f(x) \right]^{2},$ but I am not sure of the step by step for going about this computation.

how is the first step??

thank you very much!!

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    my error. the true problem is stated with $y_K$ and i wrote question as f(x)...does this answer? i am really lost here!! how do you know when to use integral vs when to use sum to find the transform?2012-06-18

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Integration by parts. You're doing an integral of the form $ \int (f(x))^2 \exp(i\xi x) dx $

Let $u = (f(x))^2$ and $dv = \exp(i \xi x)$.

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    i think so too!but how to go about this?2012-06-18