Math function atanh() to return inverse hyperbolic tangent of a input in PHP

<?Php
echo atanh(5); // Output NAN
echo "<br>";
echo atanh(1.5); // Output NAN
echo "<br>";
echo atanh(1); // Output INF
echo "<br>";
echo atanh(0.9); // Output 1.4722194895832
echo "<br>";
echo atanh(0); // Output 0
echo "<br>";
echo atanh(-0.5); // Output -0.54930614433405
echo "<br>";
echo atanh(-1); // Output -INF
echo "<br>";
echo atanh(-1.5); // Output NAN
echo "<br>";
echo atanh(-2.4); // Output NAN
?>

atanh(float X);

X is the input value
atanh returns an EDOM error if input absolute value exceeds 1.0

Questions

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

MIN() function
Math Functions

Subhendu Mohapatra

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atanh():inverse hyperbolic tangent

DEMO of atanh()

Questions

Subhendu Mohapatra