# ATAN function in Oracle

ATAN is one of the vital Numeric/Math functions of Oracle. It is used to get the arc TANGENT of a number. The ATAN function is supported in the various versions of the Oracle/PLSQL, including, Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i and Oracle 8i.
Syntax:

ATAN ( number )


Parameters:
number: It is used to specify the number to get the arc tangent value of.

Example 1:

ATAN (1)

Output:

0.78539816


Explanation:
The Arc tangent means the inverse of the tangent. The arc tangent value of 1 is 45 degrees i.e, 0.78539816 radians, and so is the result.

Example 2:

ATAN (0.5)

Output:

0.46364761


Explanation:
The Arc tangent means the inverse of the tangent. The arc tangent value of 0.5 is 26.56505118 degrees i.e, 0.463647616 radians, and so is the result.

Example 3:

ATAN (-0.5)

Output:

-0.46364761


Explanation:
The Arc tangent means the inverse of the tangent. The arc tangent value of 0.5 is -26.56505118 degrees i.e, -0.463647616 radians, and so is the result.