Math.acos( ) In JavaScript

The Math.acos( ) function in JavaScript is used to return the arccosine of a number in radians.

Math.acos(x)=arccos(x)=unique y,
where y belongs to [0;pi] 
such that cos(y)=x

The Math.acos() method returns a numeric value between 0 and pi radians.
acos() is a static method of Math, therefore, it is always used as Math.acos(), rather than as a method of a Math object created.

Syntax:

Math.acos(value)

Parameters: This function accepts single parameter value which is a number in radians who arccosine you want to find.

Returns: The Math.acos() function returns the arccosine of the given number in radians.

Examples:

Input  : Math.acos(1)
Output : 0
     
Input  : Math.acos(-1)
Output : 3.141592653589793

Input  : Math.acos(0)
Output : 1.5707963267948966

Input  : Math.acos(0.5)
Output : 1.0471975511965979

Input  : Math.acos(2)
Output : NaN

1. Example 1: When 1 is passed as a parameter.
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   <script type="text/javascript">    document.write("Output : " + Math.acos(1)); </script>

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   Output:

   Output : 0

2. Example 2: When -1 is passed as a parameter.
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   <script type="text/javascript">    document.write("Output : " + Math.acos(-1)); </script>

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   Output:

   Output : 3.141592653589793

3. Example 3: When 0 is passed as a parameter.
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   <script type="text/javascript">    document.write("Output : " + Math.acos(0)); </script>

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   Output:

   Output : 1.5707963267948966

4. Example 4: When 0.5 is passed as a parameter.
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   <script type="text/javascript">    document.write("Output : " + Math.acos(0.5)); </script>

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   Output:

   Output : 1.0471975511965979

5. Example 5: When 2 is passed as a parameter.
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   <script type="text/javascript">    document.write("Output : " + Math.acos(2)); </script>

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   Output:

   Output : NaN

Supported Browsers: The browsers supported by JavaScript Math.acos( ) function are listed below:

• Google Chrome
• Internet Explorer
• Firefox
• Opera
• Safari

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Shubrodeep Banerjee

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