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## Main Question or Discussion Point

Can anyone explain me how to prove the following identity?

[tex]\frac{\partial \hat{f}}{\partial x}(0,0) = \int \int x^2f(x,y)dxdy[/tex]

where [tex]\hat{f}[/tex] denotes the Fourier Transform of f(x,y) ?

[tex]\frac{\partial \hat{f}}{\partial x}(0,0) = \int \int x^2f(x,y)dxdy[/tex]

where [tex]\hat{f}[/tex] denotes the Fourier Transform of f(x,y) ?