JavaScript Math acos() method

The JavaScript math acos() method returns the arccosine of the given number in the form of radians. The acos() method must be in the range -1 to 1, otherwise it returns NaN.

Syntax

The acos() method is represented by the following syntax:

Parameter

num - A number.

Return

The arccosine of the number.

JavaScript Math acos() method example

Here, we will understand acos() method through various examples.

Example 1

Let's see a simple example of acos() method.

<script>
document.writeln(Math.acos(-1)+"<br>");
document.writeln(Math.acos(0)+"<br>");
document.writeln(Math.acos(0.5)+"<br>");
document.writeln(Math.acos(1));
</script>

Test it Now

Output:

3.141592653589793
1.5707963267948966
1.0471975511965979
0

Example 2

Let's see some cases where acos() method returns NaN.

<script>
document.writeln(Math.acos()+"<br>");
document.writeln(Math.acos(2)+"<br>");
document.writeln(Math.acos(-2));
</script>

Test it Now

Output:

NaN
NaN
NaN

Example 3

Here, you can test acos() method with your own test cases.

<script>
function display()
{
  var x=document.getElementById("num").value;
document.getElementById("result").innerHTML=Math.acos(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>

Test it Now

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