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!!
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!!
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 $dv = \exp(i \xi x)$.