Fourier inversion for $\hat\varphi^2$: $\int \hat\varphi(r)^2 \cos(ry)\,dr = 2\pi A_\varphi(y)$

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Fourier inversion for $\hat\varphi^2$: $\int \hat\varphi(r)^2 \cos(ry)\,dr = 2\pi A_\varphi(y)$ · Prove2Me