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Given z^4 + z^3 + z^2 + z + 1 = 0 where

[tex]z = cos(\frac{2 \pi}{5}) + i sin(\frac{2 \pi}{5})[/tex]

by using the binomial product formula.

r^n - s^n

Is that then

if r,s = z then z^4 - z^4 = 0 ?????

Sincerely and Best Regards

Bob

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# Binomial formula (HELP)

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