## ATAN2( )

This MySQL function returns the arctangent, in radians, of X and Y for a point on a Cartesian plane.

### Syntax

Below is the syntax for this command. Text within square brackets (i.e, [ and ] ) are optional. Choices are separated by bars (i.e, | ). Ellipses preceded by a comma indicates a repeating pattern. Ellipses before or after syntax are used to highlight a relevant except from the larger syntax. Text displayed in italic letters represent text that should be replaced with the specific names related to the database (e.g., *column* with the name of the column).

ATAN2(number,number)

### Explanation

This function returns the arctangent, in radians, of X and Y for a point on a Cartesian plane. The value for Y is given as the first argument and X as the second. The reverse function is `TAN( )`.

### Examples

SELECT ATAN2(10, 5); +--------------+ | ATAN2(10, 5) | +--------------+ | 1.107149 | +--------------+