فکر میکنم بهتره یه سری پارامترهای جدید تعریف کنین تا فضای کمتری اشغال کنه. مثلاً من w, x, y, z, alpha,
و beta
رو انتخاب کردم.
\documentclass[reqno,16pt]{amsart}
\usepackage{mathtools} % Required for using multlined math env.
\begin{document}
\[
\begin{bmatrix}
\frac{{\mathrm e}^{\mathrm{i} t} (w-x)}%
{\sqrt{\eta^{2}-1}}
\\[3ex]
\frac{\mathrm{i} \left(y + z\right) {\mathrm e}^{\mathrm{-i} t}}%
{\sqrt{\eta^{2}-1}}
\end{bmatrix}
\]
Where
\begin{align*}
w &= {\mathrm e}^{-2 \,\mathrm{i} \left(\left(\left(\mathrm{i}+2 \,\mathrm{i} \eta^{2}\right) \epsilon -\frac{\mathrm{i}}{12}+\eta \right) t +\left(-\frac{\mathrm{i} b_{2}}{2}+\frac{c_{2}}{2}\right) \delta^{4}+\left(-\frac{\mathrm{i} b_{1}}{2}+\frac{c_{1}}{2}\right) \delta^{2}-\frac{\mathrm{i} x}{2}\right) \sqrt{\eta^{2}-1}} \sqrt{\eta -\sqrt{\eta^{2}-1}} \\
x &= {\mathrm e}^{2 \,\mathrm{i} \left(\left(\left(\mathrm{i}+2 \,\mathrm{i} \eta^{2}\right) \epsilon -\frac{\mathrm{i}}{12}+\eta \right) t +\left(-\frac{\mathrm{i} b_{2}}{2}+\frac{c_{2}}{2}\right) \delta^{4}+\left(-\frac{\mathrm{i} b_{1}}{2}+\frac{c_{1}}{2}\right) \delta^{2}-\frac{\mathrm{i} x}{2}\right) \sqrt{\eta^{2}-1}} \sqrt{\eta +\sqrt{\eta^{2}-1}} \\
y &= -{\mathrm e}^{2 \,\mathrm{i} \alpha}\left(\mathrm{i} \eta -\mathrm{i} \sqrt{\eta^{2}-1}\right) \sqrt{\eta +\sqrt{\eta^{2}-1}} \\
z &= {\mathrm e}^{-2 \,\mathrm{i} \beta} \left(\mathrm{i} \eta +\mathrm{i} \sqrt{\eta^{2}-1}\right) \sqrt{\eta -\sqrt{\eta^{2}-1}}
\intertext{where}
\alpha &= \begin{multlined}[t]
\left(\left(\left(\mathrm{i}+2 \,\mathrm{i} \eta^{2}\right) \epsilon -\frac{\mathrm{i}}{12}+\eta \right) t +\left(-\frac{\mathrm{i} b_{2}}{2}+\frac{c_{2}}{2}\right) \delta^{4}\right.\\
+\left.\left(-\frac{\mathrm{i} b_{1}}{2}+\frac{c_{1}}{2}\right) \delta^{2}-\frac{\mathrm{i} x}{2}\right) \sqrt{\eta^{2}-1}
\end{multlined} \\
\beta &=
\begin{multlined}[t]
\left(\left(\left(\mathrm{i}+2 \,\mathrm{I} \eta^{2}\right) \epsilon -\frac{\mathrm{i}}{12}+\eta \right) t +\left(-\frac{\mathrm{i} b_{2}}{2}+\frac{c_{2}}{2}\right) \delta^{4}\right. \\
+\left.\left(-\frac{\mathrm{i} b_{1}}{2}+\frac{c_{1}}{2}\right) \delta^{2}-\frac{\mathrm{i} x}{2}\right) \sqrt{\eta^{2}-1}
\end{multlined}
\end{align*}
\end{document}
خروجی: