chore(mdx-math): add more testing contents

issue #614

contents/implementFancyMDX.mdx

@@ -242,4 +242,47 @@ A note[^1]
 
 ## Math
 
+Inline math formulas
+
 $\sqrt{a^2 + b^2}$
+
+$c = \pm\sqrt{a^2 + b^2}$
+
+Block math formulas
+
+$$
+L = \frac{1}{2} \rho v^2 S C_L
+$$
+
+$$
+\def\arraystretch{1.5}
+  \begin{array}{c:c:c}
+    a & b & c \\ \hline
+    d & e & f \\
+    \hdashline
+    g & h & i
+  \end{array}
+$$
+
+$$
+\begin{equation}
+  \begin{split}
+    a &= b + c \\
+      &= e + f
+  \end{split}
+\end{equation}
+$$
+
+$$
+\begin{align}
+  a &= b + c \\
+  d + e &= f
+\end{align}
+$$
+
+$$
+\begin{alignat}{2}
+  10 &x + &3 &y = 2 \\
+  3 &x + &13 &y = 4
+\end{alignat}
+$$