- #1
matlabber
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Homework Statement
I try to simplify to get rid of sum
[tex] \sum_{k=0}^{n-1}cos(2 \pi fk)[/tex]
Homework Equations
The Attempt at a Solution
I discover I shall use euler equation to form:[tex] \sum_{k=0}^{n-1}\frac{1}{2}(e^{2 \pi fki}+e^{-2 \pi fki})[/tex]
but how to sum exponentials?