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 tanhl()                 Calculate Long Double Hyperbolic Tangent

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

 long double tanhl(x);
 long double x;         Long double precision value (radians)

    tanhl() is the long double version of tanh(); it calculates and
    returns the hyperbolic tangent of x. For more information, see
    tanh().

    Returns:    The hyperbolic tangent of x.

 Portability:   Not supported by the ANSI standard.