Lös ut θ
\left\{\begin{matrix}\\\theta =\pi n_{2}\text{, }n_{2}\in \mathrm{Z}\text{, }&\text{unconditionally}\\\theta \in \mathrm{R}\text{, }&\exists n_{1}\in \mathrm{Z}\text{ : }ϕ=\pi n_{1}+\frac{\pi }{2}\end{matrix}\right,
Lös ut ϕ
\left\{\begin{matrix}\\ϕ=\pi n_{1}+\frac{\pi }{2}\text{, }n_{1}\in \mathrm{Z}\text{, }&\text{unconditionally}\\ϕ\in \mathrm{R}\text{, }&\exists n_{2}\in \mathrm{Z}\text{ : }\theta =\pi n_{2}\end{matrix}\right,
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