Ebatzi: r (complex solution)
r=\sqrt{\cos(2\theta )+1}
Ebatzi: θ (complex solution)
\left\{\begin{matrix}\theta =\pi n_{1}+\frac{\pi }{2}\text{, }n_{1}\in \mathrm{Z}\text{, }&r=0\\\theta =-\frac{i\ln(-\sqrt{r^{2}\left(r^{2}-2\right)}+r^{2}-1)}{2}+\pi n_{2}\text{, }n_{2}\in \mathrm{Z}\text{; }\theta =-\frac{i\ln(\sqrt{r^{2}\left(r^{2}-2\right)}+r^{2}-1)}{2}+\pi n_{3}\text{, }n_{3}\in \mathrm{Z}\text{, }&arg(r)<\pi \text{ and }r\neq 0\end{matrix}\right.
Ebatzi: r
r=\sqrt{2}|\cos(\theta )|
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