(FPCore (x) :precision binary64 (- (atan (+ x 1.0)) (atan x)))

(FPCore (x) :precision binary64 (atan2 1.0 (+ 1.0 (+ x (* x x)))))

double code(double x) {
	return atan((x + 1.0)) - atan(x);
}

double code(double x) {
	return atan2(1.0, (1.0 + (x + (x * x))));
}

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

real(8) function code(x)
    real(8), intent (in) :: x
    code = atan2(1.0d0, (1.0d0 + (x + (x * x))))
end function

public static double code(double x) {
	return Math.atan((x + 1.0)) - Math.atan(x);
}

public static double code(double x) {
	return Math.atan2(1.0, (1.0 + (x + (x * x))));
}

def code(x):
	return math.atan((x + 1.0)) - math.atan(x)

def code(x):
	return math.atan2(1.0, (1.0 + (x + (x * x))))

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

function code(x)
	return atan(1.0, Float64(1.0 + Float64(x + Float64(x * x))))
end

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

function tmp = code(x)
	tmp = atan2(1.0, (1.0 + (x + (x * x))));
end

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

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

\tan^{-1} \left(x + 1\right) - \tan^{-1} x

\tan^{-1}_* \frac{1}{1 + \left(x + x \cdot x\right)}