The asin function in JavaScript calculates the arcsine of a specified number, providing the result in radians. It is important to note that the input for the asin method must fall within the interval of -1 to 1; if it exceeds this range, the function will return NaN.
Syntax
The syntax for the asin method is expressed as follows:
Example
Math.asin(num)
Parameter
num - A number.
Return
The arcsine of the number.
JavaScript Math asin method example
In this section, we will explore the asin function by examining a variety of examples.
Example 1
Let's see a simple example of asin method.
Example
<script>
document.writeln(Math.asin(-1)+"<br>");
document.writeln(Math.asin(0)+"<br>");
document.writeln(Math.asin(0.5)+"<br>");
document.writeln(Math.asin(1));
</script>
Output:
Output
-1.5707963267948966
0
0.5235987755982989
1.5707963267948966
Example 2
Let's examine scenarios in which the asin function yields NaN.
Example
<script>
document.writeln(Math.asin()+"<br>");
document.writeln(Math.asin(2)+"<br>");
document.writeln(Math.asin(-2));
</script>
Output:
Output
NaN
NaN
NaN
Example 3
In this section, you have the opportunity to evaluate the asin method by creating and utilizing your own test cases.
Example
<script>
function display()
{
var x=document.getElementById("num").value;
document.getElementById("result").innerHTML=Math.asin(x);
}
</script>
<form>
Enter a number: <input type="text" id="num">
<input type="button" onclick="display()" value="submit">
</form>
<p><span id="result"></span></p>
