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Where , rho 1 and rho 2 are two dimensional position vectors and K is a two dimensional vector in the Fourier domain. I encountered the above Eq. (27) in an article and the author claimed that after integration the right hand side gives the following result:

I tried to solve this integral but couldn't get it right. please can anyone here can guide me how to get this result from Eq. (27).

This integral has been annoying me for a few weeks!

Thank you so much

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# A Fourier Integral help

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