Math.asin()
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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