Returns the arccosine of a number, in radians in the range 0 to Pi. The arccosine is the angle whose cosine is Number.
| Name | Type | Description |
| arg1 | number | Is the cosine of the angle you want and must be from -1 to 1. |
builder.CreateFile("xlsx");
var oWorksheet = Api.GetActiveSheet();
var oFunction = Api.GetWorksheetFunction();
oWorksheet.GetRange("A1").SetValue(oFunction.ACOS(0));
builder.SaveFile("xlsx", "ACOS.xlsx");
builder.CloseFile();