Math and Trignometric - ATAN Function

Description

The ATAN function returns the arctangent, or inverse tangent, of a number. The returned angle is given in radians between -π/2 and +π/2. The arctangent is the angle whose tangent is number.

Syntax

ATAN (number)

Arguments

Argument	Description	Required/Optional
Number	The tangent of the angle you want.	Required

Notes

If you want the angle returned by the ATAN Function to be expressed in degrees, you can convert it,
- using the Excel Degrees Function (=DEGREES (radians))
- or, by multiplying it by 180/PI()
If the specified number is not recognized as a numeric value, ATAN returns #VALUE! error

Applicability

Excel 2007, Excel 2010, Excel 2013, Excel 2016

Example

advanced_excel_math_trigonometric_functions.htm