1 files changed, 1 insertions, 1 deletions
diff --git a/js/util.js b/js/util.js
index 80fce9c..911e44b 100644
--- a/js/util.js
+++ b/js/util.js
@@ -36,7 +36,7 @@ function tan(n){ return Math.tan(n) }
 function acos(n){ return Math.cos(n) }
 function asin(n){ return Math.sin(n) }
 function atan(n){ return Math.atan(n) }
-function atan2(n){ return Math.atan2(n) }
+function atan2(a,b){ return Math.atan2(a,b) }
 function sec(n){ return 1/cos(n) }
 function csc(n){ return 1/sin(n) }
 function cot(n){ return 1/tan(n) }