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Old 2019-11-13, 17:02   #7
Dr Sardonicus
 
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Feb 2017
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I tried the minimum polynomial for 2\cos(\frac{2\pi}{11}),

x^5 + x^4 - 4*x^3 - 3*x^2 + 3*x+ 1

and the answer was a bit hard to read. I'm not sure whether it was right.
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