x / (x^2 + 1)

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?

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

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

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

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

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

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

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

\frac{x}{x \cdot x + 1}