(PHP 4 >= 4.1.0, PHP 5, PHP 7)
Inverse hyperbolic tangent
float atanh ( float $arg )
Returns the inverse hyperbolic tangent of arg
, i.e. the value whose hyperbolic tangent is arg
.
Parameters:
arg
The argument to process
Returns:
Inverse hyperbolic tangent of arg
Changelog:
5.3.0
This function is now available on all platforms
See also:
tanh() -
atan() -
asinh() -
acosh() -
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