diff --git a/sin x = 2.md b/sin x = 2.md
index 1b193b4..733a3d6 100644
--- a/sin x = 2.md	
+++ b/sin x = 2.md	
@@ -21,6 +21,7 @@ $$
 $$
 u^2 - 1 = 4iu
 $$
+$$
 u^2 - 4iu - 1 = 0
 $$
 $$