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ISFORMULA
This function tests whether a value, an expression, or the contents of a reference cell is a formula.
Syntax
ISFORMULA(reference)
Arguments
[Required] Specify the cell reference for the argument.
Remarks
This function returns FALSE if the value refers to an empty cell or no data.
This function is used to test the contents of a cell.
Examples
ISFORMULA(B4) returns false, where B4 is a cell reference with a numeric value of 56.