| $acosh(x) =ln(x+√(x^{2}-1))$ | 
|------------------------------| 

>**Note**:
 `std.math` is required for this function.

#   
#  Syntax
```swift
acosh(number)  //number can be real, float, or double.
```
# 
#  Parameters
This function requires a number as a parameter.
The value of the parameter should be greater than or equal to 1.
##
## Return value
`acosh()` returns the inverse hyperbolic cosine of a number that is sent as a parameter.
##
## Code
The following code shows how to use the `acosh()` function in D.

import core.stdc.stdio;
import std.stdio;
//header required for function
import std.math;

int main() {
    //positive number 
    writeln("The value of acosh(1.5) :", acosh(1.5));

    // 1
    writeln("The value of acosh(1.0) :", acosh(1.0));

    //less than 1
    writeln("The value of acosh(0.0): ",acosh(0.0) );
    writeln("The value of acosh(-1.5): ",acosh(-1.5) );

    return 0;
}

What is the acosh() function in D?

Calculates the inverse hyperbolic cosine of a number greater than or equal to 1.

What is the acosh() function in D?

Overview

Syntax

Parameters

Return value

Code

Explanation