tanh(3) - NetBSD Manual Pages

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TANH(3)                 NetBSD Library Functions Manual                TANH(3)


NAME

     tanh, tanhf -- hyperbolic tangent function


LIBRARY

     Math Library (libm, -lm)


SYNOPSIS

     #include <math.h>

     double
     tanh(double x);

     float
     tanhf(float x);


DESCRIPTION

     The tanh() and tanhf() functions compute the hyperbolic tangent of x.
     For a discussion of error due to roundoff, see math(3).


RETURN VALUES

     Upon successful completion, these functions return the hyperbolic tangent
     value.  The following may also occur:

           1.   If x is ± 0, x is returned.

           2.   If x is NaN, a NaN is returned.

           3.   If x is positive infinity, a value 1 is returned; if x is neg-
                ative infinity, -1 is returned.

           4.   If x is subnormal, a range error can occur and x is returned.


SEE ALSO

     acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3),
     sinh(3), tan(3)


STANDARDS

     The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').

NetBSD 6.0                    September 18, 2011                    NetBSD 6.0