Math function acosh() to return inverse hyperbolic sine of a input in PHP

Calculate inverse hyperbolic cosine

acosh() returns the inverse hyperbolic cosine of a value. Real-valued input should be 1 or greater.

echo acosh(1); // 0

The examples below build from the basic call to practical variations and edge cases.

<?Php
echo acosh(6); // Output 2.4778887302885
echo "<br>";
echo acosh(2.5); // Output 1.5667992369724
echo "<br>";
echo acosh(0); // Output NAN
echo "<br>";
echo acosh(2); // Output 1.3169578969248
echo "<br>";
echo acosh(-2.5); // Output NAN
echo "<br>";
echo acosh(-4); // Output NAN
?>

Syntax

acosh(float $num): float;

The input must be 1 or greater for a finite real result. Values below 1 return NAN.

DEMO of acosh()

Example 2: Calculating Inverse Hyperbolic Cosine for a Larger Value

The acosh() function can be used to find the inverse hyperbolic cosine for values greater than or equal to 1:

$value = 10;
$result = acosh($value);
echo "The acosh of $value is: " . $result; 
// Outputs: The acosh of 10 is: 2.99322284612638

Example 3: Using acosh() in Mathematical Operations

You can use acosh() in more complex mathematical expressions:

$value = 20;
$result = pow(acosh($value), 2) + sqrt($value);
echo $result;

Questions

What does the `acosh()` function in PHP do?
What is the purpose of the `acosh()` function in PHP?
How is the `acosh()` function used to calculate the inverse hyperbolic cosine of a number?
What is the range of values returned by the `acosh()` function in PHP?
Can the `acosh()` function be used with both positive and negative numbers?
What happens if you pass an invalid argument to the `acosh()` function?
How can you use the `acosh()` function to calculate the hyperbolic cosine given the value of the inverse hyperbolic cosine?
Are there any alternative ways to calculate the inverse hyperbolic cosine in PHP besides using the `acosh()` function?
Can the `acosh()` function return a complex number?
What type of value does the `acosh()` function return: integer, float, or something else?

COSH() function
Math Functions

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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