The Math.acos()
static method returns the inverse cosine (in radians) of a number. That is,
The Math.acos()
static method returns the inverse cosine (in radians) of a number. That is,
Math.acos(x)
x
A number between -1 and 1, inclusive, representing the angle's cosine value.
The inverse cosine (angle in radians between 0 and Ο, inclusive) of x
. If x
is less than -1 or greater than 1, 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(-2); // NaN Math.acos(-1); // 3.141592653589793 (Ο) Math.acos(0); // 1.5707963267948966 (Ο/2) Math.acos(0.5); // 1.0471975511965979 (Ο/3) Math.acos(1); // 0 Math.acos(2); // NaN
Specification |
---|
ECMAScript Language Specification # sec-math.acos |
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | ||
acos |
1 | 12 | 1 | 3 | 1 | 18 | 4 | 10.1 | 1 | 1.0 | 4.4 | 1.0 | 0.10.0 |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/acos