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 sinhl()                 Calculate Long Double Hyperbolic Sine

 #include   <math.h>
 #include   <errno.h>

 long double sinhl(x);
 long double x;                 Radians

    This is the long double precision version of sinh(); it returns the
    long double precision hyperbolic sine of x. See sinh() for more
    information.

    Returns:            The hyperbolic sine of x if successful, or
                        ._LHUGE_VAL if not.

 Portability:   Not supported by the ANSI standard.