diff --git a/src/main/function/defs.h b/src/main/function/defs.h
index 67697a7d..c19e504a 100644
--- a/src/main/function/defs.h
+++ b/src/main/function/defs.h
@@ -121,9 +121,15 @@ static const functiondef functiondefs[] = {
     {"sin", SineNode::Create},
     {"cos", CosineNode::Create},
     {"tan", TangentNode::Create},
+    {"tg", TangentNode::Create},
     {"cot", CotangentNode::Create},
+    {"cotan", CotangentNode::Create},
+    {"cotg", CotangentNode::Create},
+    {"ctg", CotangentNode::Create},
+    {"ctn", CotangentNode::Create},
     {"sec", SecantNode::Create},
     {"csc", CosecantNode::Create},
+    {"cosec", CosecantNode::Create},
     {"crd", ChordNode::Create},
     {"exsec", ExsecantNode::Create},
     {"excsc", ExcosecantNode::Create},