using uCalcSoftware; var uc = new uCalc(); uc.DefineConstant("pi = Atan(1) * 4"); // Original Cosine behavior with Radian Console.WriteLine(uc.EvalStr("Cos(pi)")); Console.WriteLine(uc.EvalStr("Cos(180)")); // Cos is renamed to CosR so that Cos can now be defined in Degree uc.ItemOf("Cos").Rename("CosR"); uc.DefineFunction("Cos(x) = CosR(x*pi/180)"); // Now Cos is in Degree Console.WriteLine(uc.EvalStr("Cos(pi)")); Console.WriteLine(uc.EvalStr("Cos(180)")); // This is the original function now named CosR Console.WriteLine(uc.EvalStr("CosR(pi)")); Console.WriteLine(uc.EvalStr("CosR(180)")); // Note: Some functions may be overloaded, such as the Cos function in // this example, which has a definition for Double and another for Complex. // This example renames only the Double precision version. // You can use NextOverload() and DataType() to pinpoint the one you want