sinh(3M)                                                    sinh(3M)


       NAME
             sinh, sinhf, cosh, coshf, tanh, tanhf, asinh, acosh, atanh -
             hyperbolic functions

       SYNOPSIS
             cc [flag . . .] file . . .  -lm [library . . .]
             #include <math.h>
             double sinh(double x);
             float sinhf(float x);
             double cosh(double x);
             float coshf(float x);
             double tanh(double x);
             float tanhf(float x);
             double asinh(double x);
             double acosh(double x);
             double atanh(double x);

       DESCRIPTION
             sinh, cosh, and tanh and the single-precision versions sinhf,
             coshf, and tanhf return, respectively, the hyperbolic sine,
             cosine, and tangent of their argument.

             asinh, acosh, and atanh return, respectively, the inverse
             hyperbolic sine, cosine, and tangent of their argument.

          Errors
             sinh, sinhf, cosh, and coshf return a value that compares
             equal to +HUGE_VAL (and sinh and sinhf will return a value
             that compares equal to -HUGE_VAL for negative x) when the
             correct value would overflow and set errno to ERANGE.

             When x is less than 1, acosh returns IEEE NaN on systems that
             support it and raises the invalid operation exception.
             Otherwise, it returns zero.  In either case it sets errno to
             EDOM.

             If |x| > 1, atanh returns IEEE NaN on systems that support it
             and raises the invalid operation exception.  Otherwise, it
             returns zero.  In either case it sets errno to EDOM.

             On systems that support IEEE NaN, if the argument to any of
             these functions is a quiet NaN, that value is returned.  If
             the argument is a signaling NaN, a quiet NaN is returned and
             the invalid operation exception is raised.  In either case,
             errno is set to EDOM.



                           Copyright 1994 Novell, Inc.               Page 1

      sinh(3M)                                                    sinh(3M)


            If the program was compiled with the -Xt compilation mode, a
            value that will compare equal to HUGE is returned instead of
            HUGE_VAL.  If |x| == 1, atanh returns IEEE NaN on systems that
            support it.  Otherwise, it returns zero.  In either case it
            sets errno to EDOM.  In addition, a message indicating SING
            error is printed on the standard error output.  These error
            handling procedures may be changed with the function matherr.

      REFERENCES
            cc(1), matherr(3M)






































                          Copyright 1994 Novell, Inc.               Page 2