Average Error: 0.0 → 0.0
Time: 3.7s
Precision: binary64
\[\]
↓
\[\]
↓
double code(double x) {
	return ((double) (2.0 * ((double) atan(((double) sqrt(((double) (((double) (1.0 - x)) / ((double) (1.0 + x))))))))));
}

↓
double code(double x) {
	return ((double) (2.0 * ((double) atan(((double) sqrt(((double) (((double) (((double) (1.0 - x)) / ((double) sqrt(((double) (1.0 + x)))))) / ((double) sqrt(((double) (1.0 + x))))))))))));
}

Error
Bits error versus x
Try it out
Your Program's Arguments
Results
Enter valid numbers for all inputs
Derivation
  1. Initial program 0.0
    \[\]
  2. Using strategy rm
  3. Applied add-sqr-sqrt0.0
    \[\leadsto \]
  4. Applied associate-/r*0.0
    \[\leadsto \]
  5. Final simplification0.0
    \[\leadsto \]
Reproduce
herbie shell --seed 2020180 
(FPCore (x)
  :name "arccos"
  :precision binary64
  (* 2.0 (atan (sqrt (/ (- 1.0 x) (+ 1.0 x))))))