Solve for β
\beta =\frac{\pi n_{1}}{2}\text{, }n_{1}\in \mathrm{Z}
\beta =\pi n_{2}+\frac{\pi -2\delta }{2}\text{, }n_{2}\in \mathrm{Z}
Solve for δ
\left\{\begin{matrix}\\\delta =\pi n_{1}+\frac{\pi -2\beta }{2}\text{, }n_{1}\in \mathrm{Z}\text{, }&\text{unconditionally}\\\delta \in \mathrm{R}\text{, }&\exists n_{2}\in \mathrm{Z}\text{ : }\beta =\frac{\pi n_{2}}{2}\end{matrix}\right.
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