diff --git a/补课/多体动力学/17_Equations_of_Motions.ipynb b/补课/多体动力学/17_Equations_of_Motions.ipynb
index 3f64bbf..44ea833 100644
--- a/补课/多体动力学/17_Equations_of_Motions.ipynb
+++ b/补课/多体动力学/17_Equations_of_Motions.ipynb
@@ -1,5 +1,17 @@
 {
- "cells": [],
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import sympy as sm\n",
+    "import sympy.physics.mechanics as me\n",
+    "me.init_vprinting(use_latex='mathjax')"
+   ]
+  }
+ ],
  "metadata": {
   "kernelspec": {
    "display_name": "Turtle",