List questions from roots-of-unity | MathQa

A proof of root of unity

Published on 03 Jun 2025 - 13:08

Algebraic values of sine at sevenths of the circle

Published on 02 Jun 2025 - 23:25

Why does the De Moivre formula work?

Published on 02 Jun 2025 - 23:40

Is there always a zero of this polynomial that is not a root of unity?

Published on 05 Jun 2025 - 5:08

Approximation of $\cos\frac{2\pi}{5}$ and $\sin\frac{2\pi}{5}$ using solutions of $z^5-1=0,z\in\mathbb{C}$

Published on 03 Jun 2025 - 22:53

Find all five solutions of the equation $z^5+z^4+z^3+z^2+z+1 = 0$

Published on 06 Jun 2025 - 15:20

Of sum of cosines and the $7$th roots of unity

Published on 03 Jun 2025 - 15:57

How to find an automorphism to enumerate the subfields of this cyclotomic field?

Published on 03 Jun 2025 - 18:05

Show root of unity summation

Published on 03 Jun 2025 - 0:40

Show root of unity and order

Published on 03 Jun 2025 - 18:12