Core JavaScript 1.5 Reference:Global Objects:Math:acos
From MDC
Contents |
[edit] Summary
Returns the arccosine (in radians) of a number.
| Method of Math | |
|
Static |
|
| Implemented in: | JavaScript 1.0, NES 2.0 |
| ECMA Version: | ECMA-262 |
[edit] Syntax
Math.acos(x)
[edit] Parameters
-
x - A number.
[edit] Description
The acos method returns a numeric value between 0 and pi radians for x between -1 and 1. If the value of number is outside this range, it returns NaN.
acos is a static method of Math, so you always use it as Math.acos(), rather than as a method of a Math object you created.
[edit] Examples
[edit] Example: Using Math.acos
The following function returns the arccosine of the variable x:
function getAcos(x) {
return Math.acos(x)
}
If you pass -1 to getAcos, it returns 3.141592653589793; if you pass 2, it returns NaN because 2 is out of range.