private string CheckToFormatAddendString(MathFunc mFunc, string addend) { if (mFunc.Equals(MathFunc.EXP) || mFunc.Equals(MathFunc.SQRT) || (mFunc.Equals(MathFunc.NEGATE) && !model.GetAugendString().Equals("0"))) { return(model.ProcessMathFunctionFormatted(mFunc)); } else if (mFunc.Equals(MathFunc.NEGATE) && model.GetAugendString().Equals("0")) { return(""); } return(addend); }