Math.acosh( ) In JavaScript

The Math.acosh() function in Javascript is used to return the hyperbolic arc-cosine of a number.
Math.acosh (x) = arcosh(x) = y ≧ 0 such that cosh (y)=x
acosh() is a static method of Math, therefore it is always used as Math.acosh(), rather than as a method of a Math object created.

Syntax:

Math.acosh(value)

Parameters Used:
1. value:It is the number whose hyperbolic arc-cosine you want to know.

Return Value:
It returns the hyperbolic arc-cosine of the given number and if the parameter passed is less than 1, it returns NaN.

Examples:

Input : Math.acosh(1)
Output : 0

Input :Math.acosh(0)
Output :NaN

Input :Math.acosh(-1)
Output :NaN

Input :Math.acosh(2)
Output : 1.3169578969248166

1. When 1 is passed as a parameter.

   <script type="text/javascript">    document.write("OUTPUT : " + Math.acosh(1)); </script>

   OUTPUT:

   OUTPUT : 0

2. When 0 is passed as a parameter.

   <script type="text/javascript">    document.write("OUTPUT : " + Math.acosh(0)); </script>

   OUTPUT:

   OUTPUT : NaN

3. When a number less than 0 is passed as a parameter.

   <script type="text/javascript">    document.write("OUTPUT : " + Math.acosh(-1)); </script>

   OUTPUT:

   OUTPUT : NaN

4. When 2 is passed as a parameter.

   <script type="text/javascript">    document.write("OUTPUT : " + Math.acosh(2)); </script>

   OUTPUT:

   OUTPUT : 1.3169578969248166