sinh(3M)                       DG/UX 5.4R3.00                       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.

       Those functions using float arguments, sinhf, coshf, and tanhf will
       give unpredictable results when used with the -Xt (which is the
       default) compilation option.  In traditional compilation mode float
       arguments are promoted to doubles.  An object compiled with -Xt will
       expect this promotion and therefore not work correctly with these
       functions.


   Considerations for Threads Programming













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sinh(3M)                       DG/UX 5.4R3.00                       sinh(3M)


                     +---------+-----------------------------+
                     |         |                      async- |
                     |function | reentrant   cancel   cancel |
                     |         |              point    safe  |
                     +---------+-----------------------------+
                     |acosh    |     Y          N        N   |
                     |asinh    |     Y          N        N   |
                     |atanh    |     Y          N        N   |
                     |cosh     |     Y          N        N   |
                     |coshf    |     Y          N        N   |
                     |sinh     |     Y          N        N   |
                     |sinhf    |     Y          N        N   |
                     |tanh     |     Y          N        N   |
                     |tanhf    |     Y          N        N   |
                     +---------+-----------------------------+

SEE ALSO
       cc(1).  reentrant(3), matherr(3M).

DIAGNOSTICS
       sinh, sinhf, cosh, and coshf return HUGE (and sinh and sinhf may
       return -HUGE for negative x) when the correct value would overflow
       and set errno to ERANGE.

       acosh returns NaN and sets errno to EDOM when the argument x is less
       than 1.  A message indicating DOMAIN error is printed on the standard
       error output.

       atanh returns NaN and sets errno to EDOM if | x| > 1.  If | x| = 1, a
       message indicating SING error is printed on the standard error
       output; if | x| > 1 the message will indicate DOMAIN error.

       Except when the -Xc compilation option is used, these error-handling
       procedures may be changed with the function matherr.  When the -Xa or
       -Xc compilation options are used, HUGE_VAL is returned instead of
       HUGE and no error messages are printed.





















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