(PHP 4 >= 4.1.0, PHP 5, PHP 7)
atanh — Inverse hyperbolic tangent
atanh ( float $arg ) : float
Returns the inverse hyperbolic tangent of arg
, i.e. the value whose hyperbolic tangent is arg
.
arg
The argument to process
Inverse hyperbolic tangent of arg
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.atanh.php