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LeanPool.Odlyzko.TestFunction.Fourier

TODO: Add doc-string.

theorem NumberField.Odlyzko.intervalIntegral_one_sub_sq_mul_cos {x : } (hx : x 0) :
(t : ) in -1..1, (1 - t ^ 2) * Real.cos (x * t) = 4 * (Real.sin x - x * Real.cos x) / x ^ 3