diff --git a/题库0.3/Problems.json b/题库0.3/Problems.json
index 791ef877..65c44e95 100644
--- a/题库0.3/Problems.json
+++ b/题库0.3/Problems.json
@@ -467098,7 +467098,7 @@
             "第六单元"
         ],
         "genre": "解答题",
-        "ans": "(1)证明略;(2)$\\arctan \\dfrac{\\2\\sqrt{13}}{3}$",
+        "ans": "(1)证明略;(2)$\\arctan \\dfrac{2\\sqrt{13}}{3}$",
         "solution": "",
         "duration": -1,
         "usages": [],