Solve for E (complex solution)
E=-\frac{-\sin(\beta )-1}{\cos(\beta )}
\nexists n_{1}\in \mathrm{Z}\text{ : }\beta =\pi n_{1}+\frac{\pi }{2}
Solve for E
E=\frac{\sin(\beta )+1}{\cos(\beta )}
\nexists n_{1}\in \mathrm{Z}\text{ : }\beta =\pi n_{1}+\frac{\pi }{2}
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