Documentation/Calc Functions/ATAN/en

Function name:
ATAN

Category:
Mathematical

Summary:
Calculates the inverse trigonometric tangent (arctangent or arctan) of a real number. The value returned is the principal value and lies in the range (-&pi;/2, &pi;/2) radians.

Syntax:
ATAN(Number)

Returns:
Returns a real number in the range (-&pi;/2, &pi;/2) that is the inverse trigonometric tangent of Number in radians.

Arguments:
Number is a real number, or a reference to a cell containing that number, whose inverse trigonometric tangent is to be calculated.


 * If Number is non-numeric, then ATAN reports a #VALUE! error.

Additional details:

 * To return the angle in degrees, use the DEGREES function.
 * Alternatively multiply by 180/PI to convert the result from radians to degrees.

The figure below illustrates the function ATAN.

Related LibreOffice functions:
ACOS

ACOT

ASIN

ATAN2

TAN

ODF standard:
Section 6.16.9, part 2

Equivalent Excel functions:
ATAN