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Cos
Last update:
May 18, 2026
Description
Calculates the cosine of an angle that is entered in radians.
Returns
A number; the cosine of the angle.
Category
Function syntax
Cos(number)See also
Parameters
Parameter | Description |
number | Angle, in radians, for which to calculate the cosine |
Usage
The range of the result is -1 to 1. To convert degrees to radians, multiply degrees by p/180. To convert radians to degrees, multiply radians by 180/p.
Note: Because the function uses floating point arithmetic, it returns a small number (such as 6.12323399574E-017) for angles that must produce 0. To test for a 0 value, check whether the value is less than 0.0000000000001.
Example
<cfscript>
val=0.5
writeOutput(cos(val))
</cfscript>Output
0.82533561491
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