diff --git a/chapters/Mathematics.tex b/chapters/Mathematics.tex
index 3ad2976c47ae6ba72483d0ee6f097d39911a4a14..1a2c2bbd0cc57e873efd33fbde10cf7bc9aacf33 100644
--- a/chapters/Mathematics.tex
+++ b/chapters/Mathematics.tex
@@ -2,31 +2,31 @@
 
 \section{鍏紡绀轰緥}
 \begin{equation}\label{eq:dewitt}
-    \int  e^{ax} \tanh bx\ dx = 
-    \begin{cases}
-    \displaystyle{ \frac{ e^{(a+2b)x}}{(a+2b)} 
-    {_2F_1}\left[ 1+\frac{a}{2b},1,2+\frac{a}{2b}, -e^{2bx}\right] }& \\
-    \displaystyle{
-    \hspace{1cm}-\frac{1}{a}e^{ax}{_2F_1}\left[ 1, \frac{a}{2b},1+\frac{a}{2b}, -e^{2bx}\right]
-    }
-     & a\ne b \\
-    \displaystyle{\frac{e^{ax}-2\tan^{-1}[e^{ax}]}{a} } & a = b
-    \end{cases}
+    \int \mathrm{e}^{ax} \tanh {bx} \, \mathrm{d}x =
+    \begin{dcases}
+        \begin{multlined}
+            \frac{\mathrm{e}^{(a+2b)x}}{(a + 2b)} \,
+            {{}_2F_1} \left( 1 + \frac{a}{2b}, 1, 2+\frac{a}{2b}, -\mathrm{e}^{2bx} \right) \\
+            - \frac{1}{a} \mathrm{e}^{ax} \, {{}_2F_1} \left( 1, \frac{a}{2b}, 1 + \frac{a}{2b}, -\mathrm{e}^{2bx} \right)
+        \end{multlined}
+        & a \ne b \\
+    \frac{e^{ax} - 2 \tan^{-1}(\mathrm{e}^{ax})}{a} & a = b
+  \end{dcases}
 \end{equation}
-    
+
 浣犲彲浠ヤ娇鐢╘lstinline|equation|鐜鎻掑叆鍏紡锛屽\cref{eq:dewitt}锛屼唬鐮佸涓�:
 \begin{lstlisting}[language=TeX]
 \begin{equation}\label{eq:dewitt}
-    \int  e^{ax} \tanh bx\ dx = 
-    \begin{cases}
-    \displaystyle{ \frac{ e^{(a+2b)x}}{(a+2b)} 
-    {_2F_1}\left[ 1+\frac{a}{2b},1,2+\frac{a}{2b}, -e^{2bx}\right] }& \\
-    \displaystyle{
-    \hspace{1cm}-\frac{1}{a}e^{ax}{_2F_1}\left[ 1, \frac{a}{2b},1+\frac{a}{2b}, -e^{2bx}\right]
-    }
-        & a\ne b \\
-    \displaystyle{\frac{e^{ax}-2\tan^{-1}[e^{ax}]}{a} } & a = b
-    \end{cases}
+    \int\mathrm{e}^{ax}\tanh{bx}\,\mathrm{d}x =
+    \begin{dcases}
+        \begin{multlined}
+            \frac{\mathrm{e}^{(a+2b)x}}{(a+2b)}\,
+            {{}_2F_1}\left( 1+\frac{a}{2b},1,2+\frac{a}{2b},-\mathrm{e}^{2bx} \right) \\
+            - \frac{1}{a} \mathrm{e}^{ax}\,{{}_2F_1}\left( 1,\frac{a}{2b},1+\frac{a}{2b},-\mathrm{e}^{2bx} \right)
+        \end{multlined}
+        & a \ne b \\
+    \frac{e^{ax}-2\tan^{-1}(\mathrm{e}^{ax})}{a} & a = b
+  \end{dcases}
 \end{equation}
 \end{lstlisting}
 
diff --git a/profile/packages.sty b/profile/packages.sty
index 251f2a5b9274da6ab72c7938c8b49482c5ef2df8..1bb952d1b19392d3b9f0638aec9576e5a67851fa 100644
--- a/profile/packages.sty
+++ b/profile/packages.sty
@@ -41,8 +41,9 @@
 
 \RequirePackage{amsmath} % Must be loaded before unicode-math
 \RequirePackage{amsthm} % Mathematical environments
+\RequirePackage{mathtools} % Mathematical tools to use with amsmath
 \RequirePackage{thmtools} % Theorem styles
-\RequirePackage{unicode-math} % Math fonts in xetexorluatex
+\RequirePackage{unicode-math} % Math fonts in xetex or luatex
 
 \RequirePackage{graphicx}
 \DeclareGraphicsExtensions{.pdf,.eps,.jpg,.png}