| a)
| \displaystyle z= \left\{\begin{matrix} \phantom{-}1 \\ -1 \\ \phantom{-}i \\ -i\\ \end{matrix}\right.
| b)
| \displaystyle z = \left\{\begin{matrix} \frac{1}{2}+\frac{1}{2}\sqrt{3}\,i \\ -1\phantom{{}-\frac{1}{2}\sqrt{3}\,i} \\ \frac{1}{2}-\frac{1}{2}\sqrt{3}\,i \\ \end{matrix}\right.
| c)
| \displaystyle z= \left\{\begin{matrix} 2^{\frac{1}{10}}e^{i(\frac{\pi}{4})} \\ 2^{\frac{1}{10}}e^{i(\frac{13\pi}{20})} \\ 2^{\frac{1}{10}}e^{i(\frac{21\pi}{20})} \\ 2^{\frac{1}{10}}e^{i(\frac{29\pi}{20})}\\ 2^{\frac{1}{10}}e^{i(\frac{37\pi}{20})} \\ \end{matrix}\right.
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