php man page for tanh

TANH(3) 								 1								   TANH(3)

tanh - Hyperbolic tangent

SYNOPSIS
       float tanh (float  $arg)

DESCRIPTION
	Returns the hyperbolic tangent of $arg, defined as sinh(arg)/cosh(arg).

PARAMETERS
	      o $arg
		- The argument to process

RETURN VALUES
	The hyperbolic tangent of $arg

SEE ALSO
       tan(3), atanh(3), sinh(3), cosh(3).

PHP Documentation Group 														   TANH(3)