Call method 'RemoveDummyFunction' for string formulas.

EPPlus/ExcelWorksheet.cs

diff --git a/EPPlus/ExcelWorksheet.cs b/EPPlus/ExcelWorksheet.cs
index ed00419..ea64e83 100644
--- a/EPPlus/ExcelWorksheet.cs
+++ b/EPPlus/ExcelWorksheet.cs
@@ -4221,7 +4221,7 @@
             }
             else if (v != null)
             {
-                return ExcelCellBase.TranslateToR1C1(v.ToString(), row, col);
+                return ExcelCellBase.TranslateToR1C1(Formulas.RemoveDummyFunction(v.ToString()), row, col);
             }
             else
             {
@@ -4239,7 +4239,7 @@
             }
             else if (v != null)
             {
-                return ExcelCellBase.TranslateToR1C1_V1(v.ToString(), row, col);
+                return ExcelCellBase.TranslateToR1C1_V1(Formulas.RemoveDummyFunction(v.ToString()), row, col);
             }
             else
             {