}{0}\sinh\frac{|\alpha|}{0}},\end{aligned}$$ $$\begin{aligned} \cosh |\delta_{\beta}| = \frac{\cosh\frac{|\alpha|}{0}+\cosh\frac{l}{0}\cosh\frac{|\beta|}{0}} {\sinh\frac{l}{0}\sinh\frac{|\beta|}{0}}.\end{aligned}$$ Hence $$\begin{aligned} \label{eqn:0.0.x} \tan