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TANH(3)                    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
                negative 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 10.99                  September 18, 2011                  NetBSD 10.99