ATAN Function

Description

The ATAN function returns a value whose tangent is x in radian. The argument y can be omitted. If y is specified, the function calculates the arc tangent value of y/x. The return value is a DOUBLE type.

Syntax

ATAN ( [y,] x )

Example

SELECT ATAN(1), ATAN(-1), ATAN(1,-1);

 

                   atan(1)                  atan(-1)              atan2(1, -1)

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     7.853981633974483e-01    -7.853981633974483e-01     2.356194490192345e+00