Numeric.SpecFunctions:invIncompleteBetaWorker from math-functions-0.1.5.2, F

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\[\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x} \]
(FPCore (x y) :precision binary64 (/ (exp (* x (log (/ x (+ x y))))) x))
double code(double x, double y) {
	return exp((x * log((x / (x + y))))) / x;
}

real(8) function code(x, y)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    code = exp((x * log((x / (x + y))))) / x
end function

public static double code(double x, double y) {
	return Math.exp((x * Math.log((x / (x + y))))) / x;
}

def code(x, y):
	return math.exp((x * math.log((x / (x + y))))) / x

function code(x, y)
	return Float64(exp(Float64(x * log(Float64(x / Float64(x + y))))) / x)
end

function tmp = code(x, y)
	tmp = exp((x * log((x / (x + y))))) / x;
end

code[x_, y_] := N[(N[Exp[N[(x * N[Log[N[(x / N[(x + y), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / x), $MachinePrecision]

\frac{e^{x \cdot \log \left(\frac{x}{x + y}\right)}}{x}