diff --git a/index.html b/index.html
index b58396a..5eca14e 100644
--- a/index.html
+++ b/index.html
@@ -34,9 +34,13 @@
     return Math.cos(a)
   }
 
+
   function sin(a) {
     return Math.sin(a);
   }
+  function asin(a) {
+    return Math.asin(a);
+  }
 </script>
 </body>
 </html>