activeSheet.setValue(0,0,1);
activeSheet.setValue(0,1,2);
activeSheet.setValue(0,2,10);
activeSheet.getCell(1,1).formula("=SUM(A1:C1)");
var test = activeSheet.getFormulaInformation(1,1, GC.Spread.Sheets.SheetArea.viewport);
alert(test.formula);