atanh() function in PHP

Theatanh()The function returns the inverse hyperbolic tangent of the specified number.

Syntax

atanh(num)

parameter

• 　num-the specified number. It needs.

returns

Theatanh()The function returns a floating-point value which is the hyperbolic tangent of the number.

Example

<?php
　　　echo(atanh(1)) . "<br>";
　　　echo(atanh(-1));
?>

Output Result

INF<br>-INF

Example

Let's look at another example-

<?php
　　　echo(atanh(M_PI_4)) . "<br>";
　　　echo(atanh(0.90) . "<br>";
　　　echo(atanh(-0.90) . "<br>";
?>

Output Result

1.0593061708232<br>1.4722194895832<br>-1.4722194895832<br>

Example

Let's look at another example-

<?php
　　　echo(atanh(0));
?>

Output Result

0