Javascript Reference - JavaScript asin() Method
The asin() method returns the
arcsine between -PI/2 and PI/2 radians.
If the parameter x is outside the range -1 to 1, it returns NaN.
Browser Support
 |
 |
 |
 |
 |
|
|---|---|---|---|---|---|
asin() |
Yes | Yes | Yes | Yes | Yes |
Syntax
Math.asin(x);
Parameter Values
| Parameter | Description |
|---|---|
| x | Required. A number |
Return Value
The asin() method returns the
arcsine of a number as a value between -PI/2 and PI/2 radians.
If the parameter x is outside the range -1 to 1, it returns NaN.
Example
The following code shows how to calculates and returns the arcsine of a number.
<!DOCTYPE html>
<html>
<body>
<script language="JavaScript">
function doMath() {<!-- w w w .j a v a 2s. c o m-->
var inputNum = document.form1.input.value;
var result = Math.asin(inputNum);
document.form1.answer.value = result;
}
</script>
<form name=form1>
This example calculates the arcsine of the entered number. <br>
<br> Enter Number: <input type="text" name="input" size=10>
<input type="button" value="Calculate" onClick='doMath()'> <br>
The arcsin is: <input type="text" name="answer" size=10>
</form>
</body>
</html>