The Math.acos()
function returns the arccosine (in radians) of a number, that is
Math.acos(x)
x
The Math.acos()
method returns a numeric value between 0 and π radians for x
between -1 and 1. If the value of x
is outside this range, it returns NaN.
Because acos()
is a static method of Math
, you always use it as Math.acos()
, rather than as a method of a Math
object you created (Math
is not a constructor).
Math.acos()
Math.acos(-2); // NaN Math.acos(-1); // 3.141592653589793 Math.acos(0); // 1.5707963267948966 Math.acos(0.5); // 1.0471975511965979 Math.acos(1); // 0 Math.acos(2); // NaN
For values less than -1 or greater than 1, Math.acos()
returns NaN.
Created by Mozilla Contributors, license: CC-BY-SA 2.5