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The [[Fourier_transform#Tables_of_important_Fourier_transforms|unitary Fourier transforms]] of the rectangular function are<ref name="wolfram"/>
:<math>\int_{-\infty}^\infty \mathrm{rect}(t)\cdot e^{-i 2\pi f t} \, dt
=\frac{\sin(\pi f)}{\pi f} = \mathrm{sinc}{(
using ordinary frequency ''f'', and
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