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Old 2019-11-13, 20:15   #9
alpertron's Avatar
Aug 2002
Buenos Aires, Argentina

2·11·61 Posts

Originally Posted by Dr Sardonicus View Post
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.
The answer shown by the application is wrong. I unchecked Pretty Print, copied the output to Notepad++, deleted all (xxx digits) and spaces, replaced i by I and finally copied that to gp. All five roots shown are non-real, so something is not good.

Another error is that the digits in group is not working. The program always shows groups of 6 digits.

I will work on that.
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