Find $n$th roots of a complex number (#660)

Find $n$th roots of a complex number (#660)

Solve zn=wz^n = w using zk=r1/nei(θ+2kπ)/nz_k = r^{1/n} e^{i(\theta + 2k\pi)/n} for k=0,1,…,n−1k = 0,1,\dots,n-1.