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Oracle9i SQL Reference
Release 2 (9.2)

Part Number A96540-02
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ATAN

Syntax

atan::=

Text description of functions21.gif follows
Text description of atan


Purpose

ATAN returns the arc tangent of n. The argument n can be in an unbounded range, and the function returns values in the range of -pi/2 to pi/2 and are expressed in radians.

Examples

The following example returns the arc tangent of .3:

SELECT ATAN(.3) "Arc_Tangent" FROM DUAL;

Arc_Tangent
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