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HYPERBOLIC(3M)                                                  HYPERBOLIC(3M)



NAME
       sinh, cosh, tanh, asinh, acosh, atanh - hyperbolic functions

SYNOPSIS
       #include <&lt;math.h>&gt;

       double sinh(x)
       double x;

       double cosh(x)
       double x;

       double tanh(x)
       double x;

       double asinh(x)
       double x;

       double acosh(x)
       double x;

       double atanh(x)
       double x;

DESCRIPTION
       These  functions  compute  the designated direct and inverse hyperbolic
       functions for real arguments.  They  inherit  much  of  their  roundoff
       error from expm1() and log1p, described in exp(3M).

DIAGNOSTICS
       These functions handle exceptional arguments in the spirit of ANSI/IEEE
       Std 754-1985.  Thus sinh() and cosh() return +-  on  overflow,  acosh()
       returns a NaN if its argument is less than 1, and atanh() returns a NaN
       if its argument has  absolute  value  greater  than  1.   In  addition,
       sinh,cosh, and tanh() may also set errno and call matherr(3M).

SEE ALSO
       exp(3M), matherr(3M)



                               22 november 1987                 HYPERBOLIC(3M)