Cannot sample enough valid points. (more)

\[\sin^{-1} \left(x + 1\right) - \sin^{-1} \left(x - 1\right)\]
\sin^{-1} \left(x + 1\right) - \sin^{-1} \left(x - 1\right)
double code(double x) {
	return ((double) (((double) asin(((double) (x + 1.0)))) - ((double) asin(((double) (x - 1.0))))));
}

Reproduce

herbie shell --seed 2020152 
(FPCore (x)
  :name "(- (asin (+ x 1.0)) (asin (- x 1.0)))"
  :precision binary64
  (- (asin (+ x 1.0)) (asin (- x 1.0))))