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This article describes the formula syntax and usage of the ACOT function in Microsoft Excel.

## Description

Returns the principal value of the arccotangent, or inverse cotangent, of a number.

## Syntax

ACOT(number)

The ACOT function syntax has the following arguments.

• Number    Required. Number is the cotangent of the angle you want. This must be a real number.

## Remarks

• The returned angle is given in radians in the range 0 (zero) to pi.

• If Number is a non-numeric value, ACOT returns the #VALUE! error value.

• Use the DEGREES function or multiply by 180/PI() to convert the result from radians to degrees.

## Example

Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.

 Formula Description Result =ACOT(2) Returns the arccotangent of 2, in radians (0.4636). 0.4636

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