Math.asin()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The Math.asin()
static method returns the inverse sine (in radians) of a number. That is,
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Syntax
js
Math.asin(x)
Parameters
x
-
A number between -1 and 1, inclusive, representing the angle's sine value.
Return value
The inverse sine (angle in radians between
and
, inclusive) of x
. If x
is less than -1 or greater than 1, returns NaN
.
Description
Because asin()
is a static method of Math
, you always use it as Math.asin()
, rather than as a method of a Math
object you created (Math
is not a constructor).
Examples
Using Math.asin()
js
Math.asin(-2); // NaN
Math.asin(-1); // -1.5707963267948966 (-π/2)
Math.asin(-0); // -0
Math.asin(0); // 0
Math.asin(0.5); // 0.5235987755982989 (π/6)
Math.asin(1); // 1.5707963267948966 (π/2)
Math.asin(2); // NaN
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.asin |
Browser compatibility
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