matlabber
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Homework Statement
Show if true:
\sum_{i=1}^{n-1}e^{2 \pi ift}=\frac{e^{2 \pi ifn}-1}{e^{2 \pi if}-1}=e^{\pi if(n-1)}\frac{e^{\pi ifn}-e^{-\pi i f n}}{e^{ \pi if}-e^{-\pi if}}\\\\\\\\
Homework Equations
I'm really stuck here, just looking for a suggestion as to what equation to use...
Can I take the log? How can I get the sum inside the exponential?
The Attempt at a Solution
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