diff --git a/advanced-math/exercise/2-function/function.pdf b/advanced-math/exercise/2-function/function.pdf
index 9e7cccf..5c546d6 100644
Binary files a/advanced-math/exercise/2-function/function.pdf and b/advanced-math/exercise/2-function/function.pdf differ
diff --git a/advanced-math/exercise/2-function/function.tex b/advanced-math/exercise/2-function/function.tex
index 7c2db6d..1af9e4b 100644
--- a/advanced-math/exercise/2-function/function.tex
+++ b/advanced-math/exercise/2-function/function.tex
@@ -370,7 +370,7 @@ $(1,-10)$为拐点，代入：$y''\vert_{x=1}=6a+2b=0$，$y\vert_{x=1}=a+b+c+d=-
 
 对于最值需要考虑极值和闭区间端点两个部分。
 
-\subsection{函数图像}
+\subsection{渐近线}
 
 \subsection{零点问题}