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Can I simplify this to a sinc function?
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The equation is
$\Gamma (N) = 1/N \sum^ N_{n=0} cos(2 \pi \psi n)$
Where $\psi$ is some constant between 0 and 1.
When plotted, it looks very much like a sinc function - any ideas on how to simplify this down?
Apologies if latex formatting doesn't work
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