Timeout after 10.0m

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\[\frac{1}{\sqrt{x}} - \frac{1}{\sqrt{x + 1}}\]

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

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

Reproduce

herbie shell --seed 2020114 +o rules:numerics
(FPCore (x)
  :name "2isqrt (example 3.6)"
  :precision binary64

  :herbie-target
  (/ 1 (+ (* (+ x 1) (sqrt x)) (* x (sqrt (+ x 1)))))

  (- (/ 1 (sqrt x)) (/ 1 (sqrt (+ x 1)))))