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Atn
Last update:
May 18, 2026
Description
Arctangent function. The arctangent is the angle whose tangent is number.
Returns
The arctangent, in radians, of a number.
Category
Function syntax
Atn(number) |
See also
Parameters
Parameter | Description |
number | Tangent of an angle |
Usage
The range of the result is -p/2 to p/2 radians. To convert degrees to radians, multiply degrees by p/180. To convert radians to degrees, multiply radians by 180/p.
Example
<cfscript>
number=0.5;
writeOutput(atn(0.5)); // Returns 0.463647609001
</cfscript>Example
<cfscript>
number=0.5;
writeOutput(atn(0.5)); // Returns 0.463647609001
</cfscript>
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