Construct seven roots and combine conjugate pairs

List all roots as \(R\operatorname{cis}(\Theta_j\pi)\), with \(0\leq\Theta_j<2\) in increasing order for \(j=0,\ldots,6\). Give the common radius, all seven angle coefficients and cyclic spacing \(\mathrm{Step}\pi\). \(\operatorname{cis}\theta\) means \(\cos\theta+i\sin\theta\)