New posts in Roots Of Unity

How to deduce this factorization of $x^5+x+1$ by looking at $\int\frac{3x^4+2x^3-2x+1}{x^5+x+1}dx$?

Find all polynomials satisfying $p(x)p(-x)=p(x^2)$

Show that $\frac{3}{5} + i\frac{4}{5}$ isn't a root of unity

Quadratic subfield of $\mathbb{Q}(\zeta)$

Evaluate $\sum_{n=0}^{\infty} \frac{z^{kn+p}}{(kn+p)!}$

Field elements which become $n$th powers after adjoining an $n$th root of unity

Why is "division by $(z-1)$" valid here?

$ \bigcup_{n=1}^{\infty}\{z\in\Bbb C:z^n=1\}=\{z\in\Bbb C:|z|=1\}$?

if 1, $\alpha_1$, $\alpha_2$, $\alpha_3$, $\ldots$, $\alpha_{n-1}$ are nth roots of unity then...

Sum of $1+4\epsilon +9\epsilon^2 +16\epsilon^3+...+2018^2 \epsilon^{2017}$