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 coshl()                 Calculate Long Double Hyperbolic Cosine

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

 long double coshl(x);
 long double x;                         Value in radians

    The coshl() function is the long double version of cosh(); it
    returns the long double hyperbolic cosine of x. See cosh() for
    more information.

    Returns:    The hyperbolic cosine of x or _LHUGE_VAL if the
                result is too large.

 Portability:   Not supported by the ANSI standard.