Ebatzi: x
\left\{\begin{matrix}\\x=2\pi n_{2}+\arcsin(\frac{2\sqrt{85}}{85})+\pi \text{, }n_{2}\in \mathrm{Z}\text{, }&\text{unconditionally}\\x\in \mathrm{R}\text{, }&\exists n_{3}\in \mathrm{Z}\text{ : }x=2\pi n_{3}+\arcsin(\frac{2\sqrt{85}}{85})\text{ and }\exists n_{4}\in \mathrm{Z}\text{ : }\left(x>\pi \left(2n_{4}-1\right)\text{ and }x<2\pi n_{4}\right)\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }x=\pi n_{1}\end{matrix}\right.
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