- #1
happyg1
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Homework Statement
hi,
I'm working on constructible things again and in one of the proofs our prof threw out this identity and I just don't know where it came from:
[tex]1+e^{\frac{2\pi}{7}i}+e^{\frac{4\pi}{7}i}+e^{\frac{6\pi}{7}i}+e^{\frac{8\pi}{7}i}+e^{\frac{10\pi}{7}i}+e^{\frac{12\pi}{7}i}=\frac{e^(\frac{12\pi}{7}i)^7-1}{e^{\frac{12\pi}{7}i}-1}[/tex]
HOW did he get that?
Edit: I can't tell if the final term is supposed to be 2pi of 12 pi. I dunno.
Homework Equations
The Attempt at a Solution
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