php man page for atanh

ATANH(3)								 1								  ATANH(3)

atanh - Inverse hyperbolic tangent

SYNOPSIS
       float atanh (float  $arg)

DESCRIPTION
	Returns the inverse hyperbolic tangent of $arg, i.e. the value whose hyperbolic tangent is $arg.

PARAMETERS
	      o $arg
		- The argument to process

RETURN VALUES
	Inverse hyperbolic tangent of $arg

CHANGELOG
       +--------+--------------------------------------------------+
       |Version |						   |
       |	|						   |
       |	|		    Description 		   |
       |	|						   |
       +--------+--------------------------------------------------+
       | 5.3.0	|						   |
       |	|						   |
       |	|  This function is now available on all platforms |
       |	|						   |
       +--------+--------------------------------------------------+
SEE ALSO
       tanh(3), atan(3), asinh(3), acosh(3).

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