opensolaris man page for tanh

tanh(3M)						  Mathematical Library Functions						  tanh(3M)

NAME
       tanh, tanhf, tanhl - hyperbolic tangent function

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double tanh(double x);

       float tanhf(float x);

       long double tanhl(long double x);

DESCRIPTION
       These functions compute the hyperbolic tangent of their argument x.

RETURN VALUES
       Upon successful completion, these functions return the hyperbolic tangent of x.

       If x is NaN, a NaN is returned.

       If x is +-0, x is returned.

       If x is +-Inf, +-1 is returned.

ERRORS
       No errors are defined.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       atanh(3M), isnan(3M), math.h(3HEAD), tan(3M), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							  tanh(3M)