Click on the symbol and then on the infinity symbol. Understanding the Number Format Code You can change the format of a cells value by either using various formats available in Excel or creating a custom format using number format code. Look for relevant math symbol to insert on your document.
Select cell A3 to add that cell reference to the formula after the equal sign.
Enter the formula you want to use. In addition Excel supports grouping with parentheses and concatenation. Excel also provides support for cell ranges and range intersects. The second is to use the InsertEquation menu item.