Prelude:atanh from fay-base-0.20.0.1

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\[\frac{x + 1}{1 - x} \]
(FPCore (x) :precision binary64 (/ (+ x 1.0) (- 1.0 x)))
double code(double x) {
	return (x + 1.0) / (1.0 - x);
}

real(8) function code(x)
    real(8), intent (in) :: x
    code = (x + 1.0d0) / (1.0d0 - x)
end function

public static double code(double x) {
	return (x + 1.0) / (1.0 - x);
}

def code(x):
	return (x + 1.0) / (1.0 - x)

function code(x)
	return Float64(Float64(x + 1.0) / Float64(1.0 - x))
end

function tmp = code(x)
	tmp = (x + 1.0) / (1.0 - x);
end

code[x_] := N[(N[(x + 1.0), $MachinePrecision] / N[(1.0 - x), $MachinePrecision]), $MachinePrecision]

\frac{x + 1}{1 - x}