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 asinl()                 Calculate Long Double ArcSine

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

 long double asinl(x);
 long double x

    This is the long double-precision version of asin(); it returns
    the long double arcsine of x. See asin() for more information.

    Returns:            The arcsine result, or 0 if x is greater than 1 or
                        less than -1.

 Portability:   Not supported by the ANSI standard.