Adding functions to Standard Library

src/StandardLibrary/Functions/Trigonometry/Hyperbolic/Cosh.cs

@@ -0,0 +1,33 @@
+namespace CSMic.StandardLibrary.Functions.Trigonometry.Hyperbolic
+{
+    public class Cosh : FunctionBase, ICodedFunction
+    {
+
+        public string Name
+        {
+            get
+            {
+                return "cosh";
+            }
+        }
+
+        public override IEnumerable<FunctionArgument> ExpectedArguments
+        {
+            get
+            {
+                yield return new FunctionArgument("value", FunctionValue.NUMBER);
+            }
+        }
+
+        public FunctionValue Execute(params FunctionArgument[] args)
+        {
+            return Execute(args, (_args) =>
+            {
+                var input = _args[0].Value;
+                decimal value = Convert.ToDecimal(input.Value);
+
+                return new FunctionValue(FunctionValueType.Numeric, Math.Cosh((double)value));
+            });
+        }
+    }
+}