In the following link:(adsbygoogle = window.adsbygoogle || []).push({});

http://electron6.phys.utk.edu/QM1/modules/m1/free_particle.htm

please look at the part where it says "We may write the Fourier transform of...". I am unable to understand how the next following steps work. Could someone explain this please? :)

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# Quick Fourier-Like Question

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