diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index 43457f3..9a459eb 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -80,14 +80,26 @@ class BuiltinFunction
     {
         return sin(arg1);
     }
+    static double SINH(double arg1)
+    {
+        return sinh(arg1);
+    }
     static double COS(double arg1)
     {
         return cos(arg1);
     }
+    static double COSH(double arg1)
+    {
+        return cosh(arg1);
+    }
     static double TAN(double arg1)
     {
         return tan(arg1);
     }
+    static double TANH(double arg1)
+    {
+        return tanh(arg1);
+    }
     static double RAD(double arg1)
     {
         return arg1 * std.math.PI / 180;