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SQL-92
Guide and Reference
ATAN2 Function
Returns the arctangent of the x and y coordinates specified by expression1 and expression2.
SYNTAX
EXAMPLE
The following example illustrates two ways to use the ATAN2 function:
NOTES
- ATAN2 takes the ratio of two sides of a right triangle and returns the corresponding angle. The ratio is the length of the side opposite the angle divided by the length of the side adjacent to the angle.
expression1
andexpression2
specify the x and y coordinates of the end of the hypotenuse opposite the angle.- The result is expressed in radians and is in the range -pi/2 to pi/2 radians. To convert degrees to radians, multiply degrees by pi/180. To convert radians to degrees, multiply radians by 180/pi.
- Both
expression1
andexpression2
must evaluate to approximate numeric data types.COMPATIBILITY
ODBC Compatible
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