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TANH(P) 			    POSIX Programmer's Manual				  TANH(P)

       tanh, tanhf, tanhl - hyperbolic tangent functions

       #include <math.h>

       double tanh(double x);
       float tanhf(float x);
       long double tanhl(long double x);

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

       An  application	wishing  to  check for error situations should set errno to zero and call
       feclearexcept(FE_ALL_EXCEPT) before calling these functions.  On return, if errno is  non-
       zero  or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero,
       an error has occurred.

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

       If x is NaN, a NaN shall be returned.

       If x is +-0, x shall be returned.

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

       If x is subnormal, a range error may occur and x should be returned.

       These functions may fail if:

       Range Error
	      The value of x is subnormal.

       If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be
       set  to	[ERANGE].  If  the integer expression (math_errhandling & MATH_ERREXCEPT) is non-
       zero, then the underflow floating-point exception shall be raised.

       The following sections are informative.


       On  error,  the	expressions  (math_errhandling	&  MATH_ERRNO)	and  (math_errhandling	&
       MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero.



       atanh() , feclearexcept() , fetestexcept() , isnan() , tan() , the Base Definitions volume
       of IEEE Std 1003.1-2001, Section 4.18, Treatment  of  Error  Conditions	for  Mathematical
       Functions, <math.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					  TANH(P)
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