\documentclass{article}
\usepackage{amsmath}

\begin{document}
\[\newcommand{\Bold}[1]{\mathbf{#1}}\frac{{\left({\left(B_{n} C_{n}
G_{l} + B_{n} G_{l} \overline{W_{l}}\right)} e^{\left(W_{l} r + C_{n} t
+ r \overline{W_{l}}\right)} - {\left(B_{n} C_{n} \overline{G_{l}} -
B_{n} W_{l} \overline{G_{l}} + {\left(B_{n} C_{n} G_{l} - B_{n} C_{n}
\overline{G_{l}} + B_{n} W_{l} \overline{G_{l}} + B_{n} G_{l}
\overline{W_{l}}\right)} e^{\left(C_{n} r + r
\overline{W_{l}}\right)}\right)} e^{\left(W_{l} t\right)}\right)}
e^{\left(-C_{n} t - W_{l} t - r \overline{W_{l}}\right)}}{C_{n}^{2} -
C_{n} W_{l} + {\left(C_{n} - W_{l}\right)} \overline{W_{l}}}\]

\[\newcommand{\Bold}[1]{\mathbf{#1}}-\frac{B_{m} B_{n} C_{m}^{2}
C_{n}^{2} G_{l} L_{k}^{2} P_{k} e^{\left(-C_{m} t - C_{n} t\right)} +
B_{m} B_{n} C_{m} C_{n}^{3} G_{l} L_{k}^{2} P_{k} e^{\left(-C_{m} t -
C_{n} t\right)} + B_{m} B_{n} C_{m}^{2} C_{n} G_{l} L_{k}^{3} P_{k}
e^{\left(-C_{m} t - C_{n} t\right)} + B_{m} B_{n} C_{m} C_{n}^{2} G_{l}
L_{k}^{3} P_{k} e^{\left(-C_{m} t - C_{n} t\right)} + B_{m} B_{n}
C_{m}^{2} C_{n} G_{l} L_{k}^{2} P_{k} W_{l} e^{\left(-C_{m} t - C_{n}
t\right)} + B_{m} B_{n} C_{n}^{3} G_{l} L_{k}^{2} P_{k} W_{l}
e^{\left(-C_{m} t - C_{n} t\right)} + B_{m} B_{n} C_{m}^{2} G_{l}
L_{k}^{3} P_{k} W_{l} e^{\left(-C_{m} t - C_{n} t\right)} + B_{m} B_{n}
C_{n}^{2} G_{l} L_{k}^{3} P_{k} W_{l} e^{\left(-C_{m} t - C_{n}
t\right)} - B_{m} B_{n} C_{m}^{2} C_{n}^{2} G_{l} P_{k} W_{l}^{2}
e^{\left(-C_{m} t - C_{n} t\right)} - B_{m} B_{n} C_{m} C_{n}^{3} G_{l}
P_{k} W_{l}^{2} e^{\left(-C_{m} t - C_{n} t\right)} - B_{m} B_{n}
C_{m}^{2} C_{n} G_{l} L_{k} P_{k} W_{l}^{2} e^{\left(-C_{m} t - C_{n}
t\right)} - B_{m} B_{n} C_{m} C_{n}^{2} G_{l} L_{k} P_{k} W_{l}^{2}
e^{\left(-C_{m} t - C_{n} t\right)} - B_{m} B_{n} C_{m} C_{n} G_{l}
L_{k}^{2} P_{k} W_{l}^{2} e^{\left(-C_{m} t - C_{n} t\right)} - B_{m}
B_{n} C_{n}^{2} G_{l} L_{k}^{2} P_{k} W_{l}^{2} e^{\left(-C_{m} t -
C_{n} t\right)} - B_{m} B_{n} C_{m} G_{l} L_{k}^{3} P_{k} W_{l}^{2}
e^{\left(-C_{m} t - C_{n} t\right)} - B_{m} B_{n} C_{n} G_{l} L_{k}^{3}
P_{k} W_{l}^{2} e^{\left(-C_{m} t - C_{n} t\right)} - B_{m} B_{n}
C_{m}^{2} C_{n} G_{l} P_{k} W_{l}^{3} e^{\left(-C_{m} t - C_{n}
t\right)} - B_{m} B_{n} C_{n}^{3} G_{l} P_{k} W_{l}^{3} e^{\left(-C_{m}
t - C_{n} t\right)} - B_{m} B_{n} C_{m}^{2} G_{l} L_{k} P_{k} W_{l}^{3}
e^{\left(-C_{m} t - C_{n} t\right)} - B_{m} B_{n} C_{n}^{2} G_{l} L_{k}
P_{k} W_{l}^{3} e^{\left(-C_{m} t - C_{n} t\right)} - 2 \, B_{m} B_{n}
C_{n} G_{l} L_{k}^{2} P_{k} W_{l}^{3} e^{\left(-C_{m} t - C_{n}
t\right)} - 2 \, B_{m} B_{n} G_{l} L_{k}^{3} P_{k} W_{l}^{3}
e^{\left(-C_{m} t - C_{n} t\right)} + B_{m} B_{n} C_{m} C_{n} G_{l}
P_{k} W_{l}^{4} e^{\left(-C_{m} t - C_{n} t\right)} + B_{m} B_{n}
C_{n}^{2} G_{l} P_{k} W_{l}^{4} e^{\left(-C_{m} t - C_{n} t\right)} +
B_{m} B_{n} C_{m} G_{l} L_{k} P_{k} W_{l}^{4} e^{\left(-C_{m} t - C_{n}
t\right)} + B_{m} B_{n} C_{n} G_{l} L_{k} P_{k} W_{l}^{4}
e^{\left(-C_{m} t - C_{n} t\right)} + 2 \, B_{m} B_{n} C_{n} G_{l} P_{k}
W_{l}^{5} e^{\left(-C_{m} t - C_{n} t\right)} + 2 \, B_{m} B_{n} G_{l}
L_{k} P_{k} W_{l}^{5} e^{\left(-C_{m} t - C_{n} t\right)} - B_{m} B_{n}
C_{m}^{2} C_{n}^{2} G_{l} L_{k}^{2} P_{k} e^{\left(-C_{m} t - W_{l}
t\right)} - B_{m} B_{n} C_{m} C_{n}^{3} G_{l} L_{k}^{2} P_{k}
e^{\left(-C_{m} t - W_{l} t\right)} - B_{m} B_{n} C_{m}^{2} C_{n} G_{l}
L_{k}^{3} P_{k} e^{\left(-C_{m} t - W_{l} t\right)} - B_{m} B_{n} C_{m}
C_{n}^{2} G_{l} L_{k}^{3} P_{k} e^{\left(-C_{m} t - W_{l} t\right)} -
B_{m} B_{n} C_{m}^{2} C_{n} G_{l} L_{k}^{2} P_{k} W_{l} e^{\left(-C_{m}
t - W_{l} t\right)} + B_{m} B_{n} C_{n}^{3} G_{l} L_{k}^{2} P_{k} W_{l}
e^{\left(-C_{m} t - W_{l} t\right)} - B_{m} B_{n} C_{m}^{2} G_{l}
L_{k}^{3} P_{k} W_{l} e^{\left(-C_{m} t - W_{l} t\right)} + B_{m} B_{n}
C_{n}^{2} G_{l} L_{k}^{3} P_{k} W_{l} e^{\left(-C_{m} t - W_{l}
t\right)} + B_{m} B_{n} C_{m}^{2} C_{n}^{2} G_{l} P_{k} W_{l}^{2}
e^{\left(-C_{m} t - W_{l} t\right)} + B_{m} B_{n} C_{m} C_{n}^{3} G_{l}
P_{k} W_{l}^{2} e^{\left(-C_{m} t - W_{l} t\right)} + B_{m} B_{n}
C_{m}^{2} C_{n} G_{l} L_{k} P_{k} W_{l}^{2} e^{\left(-C_{m} t - W_{l}
t\right)} + B_{m} B_{n} C_{m} C_{n}^{2} G_{l} L_{k} P_{k} W_{l}^{2}
e^{\left(-C_{m} t - W_{l} t\right)} + B_{m} B_{n} C_{m} C_{n} G_{l}
L_{k}^{2} P_{k} W_{l}^{2} e^{\left(-C_{m} t - W_{l} t\right)} + B_{m}
B_{n} C_{n}^{2} G_{l} L_{k}^{2} P_{k} W_{l}^{2} e^{\left(-C_{m} t -
W_{l} t\right)} + B_{m} B_{n} C_{m} G_{l} L_{k}^{3} P_{k} W_{l}^{2}
e^{\left(-C_{m} t - W_{l} t\right)} + B_{m} B_{n} C_{n} G_{l} L_{k}^{3}
P_{k} W_{l}^{2} e^{\left(-C_{m} t - W_{l} t\right)} + B_{m} B_{n}
C_{m}^{2} C_{n} G_{l} P_{k} W_{l}^{3} e^{\left(-C_{m} t - W_{l}
t\right)} - B_{m} B_{n} C_{n}^{3} G_{l} P_{k} W_{l}^{3} e^{\left(-C_{m}
t - W_{l} t\right)} + B_{m} B_{n} C_{m}^{2} G_{l} L_{k} P_{k} W_{l}^{3}
e^{\left(-C_{m} t - W_{l} t\right)} - B_{m} B_{n} C_{n}^{2} G_{l} L_{k}
P_{k} W_{l}^{3} e^{\left(-C_{m} t - W_{l} t\right)} - B_{m} B_{n} C_{m}
C_{n} G_{l} P_{k} W_{l}^{4} e^{\left(-C_{m} t - W_{l} t\right)} - B_{m}
B_{n} C_{n}^{2} G_{l} P_{k} W_{l}^{4} e^{\left(-C_{m} t - W_{l}
t\right)} - B_{m} B_{n} C_{m} G_{l} L_{k} P_{k} W_{l}^{4}
e^{\left(-C_{m} t - W_{l} t\right)} - B_{m} B_{n} C_{n} G_{l} L_{k}
P_{k} W_{l}^{4} e^{\left(-C_{m} t - W_{l} t\right)} + B_{m} B_{n}
C_{m}^{3} C_{n}^{2} G_{l} L_{k} P_{k} e^{\left(-C_{n} t - W_{l}
t\right)} + B_{m} B_{n} C_{m}^{2} C_{n}^{3} G_{l} L_{k} P_{k}
e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n} C_{m}^{3} C_{n} G_{l}
L_{k}^{2} P_{k} e^{\left(-C_{n} t - W_{l} t\right)} - B_{m} B_{n} C_{m}
C_{n}^{3} G_{l} L_{k}^{2} P_{k} e^{\left(-C_{n} t - W_{l} t\right)} -
B_{m} B_{n} C_{m}^{2} C_{n} G_{l} L_{k}^{3} P_{k} e^{\left(-C_{n} t -
W_{l} t\right)} - B_{m} B_{n} C_{m} C_{n}^{2} G_{l} L_{k}^{3} P_{k}
e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n} C_{m}^{3} C_{n}^{2}
G_{l} P_{k} W_{l} e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n}
C_{m}^{2} C_{n}^{3} G_{l} P_{k} W_{l} e^{\left(-C_{n} t - W_{l}
t\right)} - B_{m} B_{n} C_{m}^{3} G_{l} L_{k}^{2} P_{k} W_{l}
e^{\left(-C_{n} t - W_{l} t\right)} - B_{m} B_{n} C_{n}^{3} G_{l}
L_{k}^{2} P_{k} W_{l} e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n}
C_{m}^{2} G_{l} L_{k}^{3} P_{k} W_{l} e^{\left(-C_{n} t - W_{l}
t\right)} - B_{m} B_{n} C_{n}^{2} G_{l} L_{k}^{3} P_{k} W_{l}
e^{\left(-C_{n} t - W_{l} t\right)} - B_{m} B_{n} C_{m}^{3} C_{n} G_{l}
P_{k} W_{l}^{2} e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n} C_{m}
C_{n}^{3} G_{l} P_{k} W_{l}^{2} e^{\left(-C_{n} t - W_{l} t\right)} -
B_{m} B_{n} C_{m}^{3} G_{l} L_{k} P_{k} W_{l}^{2} e^{\left(-C_{n} t -
W_{l} t\right)} - B_{m} B_{n} C_{n}^{3} G_{l} L_{k} P_{k} W_{l}^{2}
e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n} C_{m} G_{l} L_{k}^{3}
P_{k} W_{l}^{2} e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n} C_{n}
G_{l} L_{k}^{3} P_{k} W_{l}^{2} e^{\left(-C_{n} t - W_{l} t\right)} -
B_{m} B_{n} C_{m}^{2} C_{n} G_{l} P_{k} W_{l}^{3} e^{\left(-C_{n} t -
W_{l} t\right)} - B_{m} B_{n} C_{m} C_{n}^{2} G_{l} P_{k} W_{l}^{3}
e^{\left(-C_{n} t - W_{l} t\right)} - B_{m} B_{n} C_{m}^{2} G_{l} L_{k}
P_{k} W_{l}^{3} e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n}
C_{n}^{2} G_{l} L_{k} P_{k} W_{l}^{3} e^{\left(-C_{n} t - W_{l}
t\right)} + B_{m} B_{n} C_{m} G_{l} L_{k}^{2} P_{k} W_{l}^{3}
e^{\left(-C_{n} t - W_{l} t\right)} + B_{m} B_{n} C_{n} G_{l} L_{k}^{2}
P_{k} W_{l}^{3} e^{\left(-C_{n} t - W_{l} t\right)} - B_{m} B_{n}
C_{m}^{3} C_{n}^{2} G_{l} L_{k} P_{k} - B_{m} B_{n} C_{m}^{2} C_{n}^{3}
G_{l} L_{k} P_{k} - B_{m} B_{n} C_{m}^{3} C_{n} G_{l} L_{k}^{2} P_{k} +
B_{m} B_{n} C_{m} C_{n}^{3} G_{l} L_{k}^{2} P_{k} + B_{m} B_{n}
C_{m}^{2} C_{n} G_{l} L_{k}^{3} P_{k} + B_{m} B_{n} C_{m} C_{n}^{2}
G_{l} L_{k}^{3} P_{k} + B_{m} B_{n} C_{m}^{3} C_{n}^{2} G_{l} P_{k}
W_{l} + B_{m} B_{n} C_{m}^{2} C_{n}^{3} G_{l} P_{k} W_{l} + B_{m} B_{n}
C_{m}^{3} G_{l} L_{k}^{2} P_{k} W_{l} - B_{m} B_{n} C_{n}^{3} G_{l}
L_{k}^{2} P_{k} W_{l} - B_{m} B_{n} C_{m}^{2} G_{l} L_{k}^{3} P_{k}
W_{l} - B_{m} B_{n} C_{n}^{2} G_{l} L_{k}^{3} P_{k} W_{l} + B_{m} B_{n}
C_{m}^{3} C_{n} G_{l} P_{k} W_{l}^{2} - B_{m} B_{n} C_{m} C_{n}^{3}
G_{l} P_{k} W_{l}^{2} + B_{m} B_{n} C_{m}^{3} G_{l} L_{k} P_{k}
W_{l}^{2} + B_{m} B_{n} C_{n}^{3} G_{l} L_{k} P_{k} W_{l}^{2} - B_{m}
B_{n} C_{m} G_{l} L_{k}^{3} P_{k} W_{l}^{2} - B_{m} B_{n} C_{n} G_{l}
L_{k}^{3} P_{k} W_{l}^{2} - 2 \, B_{m} B_{n} C_{m}^{3} G_{l} P_{k}
W_{l}^{3} - B_{m} B_{n} C_{m}^{2} C_{n} G_{l} P_{k} W_{l}^{3} - B_{m}
B_{n} C_{m} C_{n}^{2} G_{l} P_{k} W_{l}^{3} + B_{m} B_{n} C_{m}^{2}
G_{l} L_{k} P_{k} W_{l}^{3} + B_{m} B_{n} C_{n}^{2} G_{l} L_{k} P_{k}
W_{l}^{3} - B_{m} B_{n} C_{m} G_{l} L_{k}^{2} P_{k} W_{l}^{3} + B_{m}
B_{n} C_{n} G_{l} L_{k}^{2} P_{k} W_{l}^{3} + 2 \, B_{m} B_{n} G_{l}
L_{k}^{3} P_{k} W_{l}^{3} + 2 \, B_{m} B_{n} C_{m} G_{l} P_{k}
W_{l}^{5} - 2 \, B_{m} B_{n} G_{l} L_{k} P_{k} W_{l}^{5}}{C_{m}^{4}
C_{n}^{3} L_{k}^{2} + C_{m}^{3} C_{n}^{4} L_{k}^{2} + C_{m}^{4}
C_{n}^{2} L_{k}^{3} - C_{m}^{2} C_{n}^{4} L_{k}^{3} - C_{m}^{3}
C_{n}^{2} L_{k}^{4} - C_{m}^{2} C_{n}^{3} L_{k}^{4} - C_{m}^{4}
C_{n}^{3} W_{l}^{2} - C_{m}^{3} C_{n}^{4} W_{l}^{2} - C_{m}^{4}
C_{n}^{2} L_{k} W_{l}^{2} + C_{m}^{2} C_{n}^{4} L_{k} W_{l}^{2} -
C_{m}^{4} C_{n} L_{k}^{2} W_{l}^{2} - C_{m} C_{n}^{4} L_{k}^{2}
W_{l}^{2} - C_{m}^{4} L_{k}^{3} W_{l}^{2} + C_{n}^{4} L_{k}^{3}
W_{l}^{2} + C_{m}^{3} L_{k}^{4} W_{l}^{2} + C_{m}^{2} C_{n} L_{k}^{4}
W_{l}^{2} + C_{m} C_{n}^{2} L_{k}^{4} W_{l}^{2} + C_{n}^{3} L_{k}^{4}
W_{l}^{2} + C_{m}^{4} C_{n} W_{l}^{4} + C_{m}^{3} C_{n}^{2} W_{l}^{4} +
C_{m}^{2} C_{n}^{3} W_{l}^{4} + C_{m} C_{n}^{4} W_{l}^{4} + C_{m}^{4}
L_{k} W_{l}^{4} - C_{n}^{4} L_{k} W_{l}^{4} - C_{m}^{3} L_{k}^{2}
W_{l}^{4} - C_{n}^{3} L_{k}^{2} W_{l}^{4} + C_{m}^{2} L_{k}^{3}
W_{l}^{4} - C_{n}^{2} L_{k}^{3} W_{l}^{4} - C_{m} L_{k}^{4} W_{l}^{4} -
C_{n} L_{k}^{4} W_{l}^{4} - C_{m}^{2} C_{n} W_{l}^{6} - C_{m} C_{n}^{2}
W_{l}^{6} - C_{m}^{2} L_{k} W_{l}^{6} + C_{n}^{2} L_{k} W_{l}^{6} +
C_{m} L_{k}^{2} W_{l}^{6} + C_{n} L_{k}^{2} W_{l}^{6}} + \frac{B_{m}
B_{n} C_{n} G_{l} L_{k} P_{k} e^{\left(-C_{n} t - L_{k} t\right)} +
B_{m} B_{n} G_{l} L_{k}^{2} P_{k} e^{\left(-C_{n} t - L_{k} t\right)} +
B_{m} B_{n} C_{n} G_{l} P_{k} W_{l} e^{\left(-C_{n} t - L_{k}
t\right)} - B_{m} B_{n} G_{l} L_{k} P_{k} W_{l} e^{\left(-C_{n} t -
L_{k} t\right)} - 2 \, B_{m} B_{n} G_{l} P_{k} W_{l}^{2} e^{\left(-C_{n}
t - L_{k} t\right)} - B_{m} B_{n} C_{n} G_{l} L_{k} P_{k}
e^{\left(-L_{k} t - W_{l} t\right)} - B_{m} B_{n} G_{l} L_{k}^{2} P_{k}
e^{\left(-L_{k} t - W_{l} t\right)} + B_{m} B_{n} C_{n} G_{l} P_{k}
W_{l} e^{\left(-L_{k} t - W_{l} t\right)} + B_{m} B_{n} G_{l} L_{k}
P_{k} W_{l} e^{\left(-L_{k} t - W_{l} t\right)}}{C_{m} C_{n}^{2}
L_{k}^{2} + C_{m} C_{n} L_{k}^{3} - C_{n}^{2} L_{k}^{3} - C_{n}
L_{k}^{4} - C_{m} C_{n} L_{k}^{2} W_{l} - C_{m} L_{k}^{3} W_{l} + C_{n}
L_{k}^{3} W_{l} + L_{k}^{4} W_{l} - C_{m} C_{n}^{2} W_{l}^{2} - C_{m}
C_{n} L_{k} W_{l}^{2} + C_{n}^{2} L_{k} W_{l}^{2} + C_{n} L_{k}^{2}
W_{l}^{2} + C_{m} C_{n} W_{l}^{3} + C_{m} L_{k} W_{l}^{3} - C_{n} L_{k}
W_{l}^{3} - L_{k}^{2} W_{l}^{3}}\]
\end{document}
