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 atanl()                 Calculate Long Double ArcTangent

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

 long double atanl(x);
 long double x                  Long Double

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

    Returns:    Actangent of x.

 Portability:   Not supported by the ANSI standard.