diff --git a/advanced-math/knowledge/4-indefinite-integral-and-definite-integral/indefinite-integral-and-definite-integral.tex b/advanced-math/knowledge/4-indefinite-integral-and-definite-integral/indefinite-integral-and-definite-integral.tex
index e9c05c3..5274b5e 100644
--- a/advanced-math/knowledge/4-indefinite-integral-and-definite-integral/indefinite-integral-and-definite-integral.tex
+++ b/advanced-math/knowledge/4-indefinite-integral-and-definite-integral/indefinite-integral-and-definite-integral.tex
@@ -558,5 +558,4 @@ $S_n=\sum\limits_{i=1}^n\Vert\overline{M_{i-1}M_{i}}\Vert$，$S=\lim\limits_{\de
 
 如果是极坐标方程，则$S=\int_\alpha^\beta\sqrt{\rho^2+\rho'^2}\,\textrm{d}\theta$。
 
-
 \end{document}