﻿ ATAN function

# ATAN function

Returns the arctangent, or inverse tangent, of a number. The arctangent is the angle whose tangent is number. The returned angle is given in radians in the range -pi/2 to pi/2.

Syntax

ATAN (number)

Number     is the tangent of the angle you want.

Remark

To express the arctangent in degrees, multiply the result by 180/PI( ) or use the DEGREES function.

Example

The example may be easier to understand if you copy it to a blank worksheet.

How to copy an example

1. Create a blank workbook or worksheet.

2. Select the example in the Help topic.

Note   Do not select the row or column headers.

Selecting an example from Help

3. Press CTRL+C.

4. In the worksheet, select cell A1, and press CTRL+V.

5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

 1 2 3 4
 A B Formula Description (Result) =ATAN(1) Arctangent of 1 in radians, pi/4 (0.785398) =ATAN(1)*180/PI() Arctangent of 1 in degrees (45) =DEGREES(ATAN(1)) Arctangent of 1 in degrees (45)

Applies To: Excel 2007

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