def is_formula(self) -> IsFormulaRequestBuilder:
        """
        Provides operations to call the isFormula method.
        """
        from .is_formula.is_formula_request_builder import IsFormulaRequestBuilder

        return IsFormulaRequestBuilder(self.request_adapter, self.path_parameters)

        Provides operations to call the isFormula method.
        
msgraph/generated/drives/item/items/item/workbook/functions/functions_request_builder.py