\[\sqrt{\frac{e^{2 \cdot x} - 1}{e^{x} - 1}}\]

\sqrt{\frac{e^{2 \cdot x} - 1}{e^{x} - 1}}

double f(double x) {
        double r23084 = 2.0;
        double r23085 = x;
        double r23086 = r23084 * r23085;
        double r23087 = exp(r23086);
        double r23088 = 1.0;
        double r23089 = r23087 - r23088;
        double r23090 = exp(r23085);
        double r23091 = r23090 - r23088;
        double r23092 = r23089 / r23091;
        double r23093 = sqrt(r23092);
        return r23093;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019323 +o rules:numerics
(FPCore (x)
  :name "sqrtexp (problem 3.4.4)"
  :precision binary64
  (sqrt (/ (- (exp (* 2 x)) 1) (- (exp x) 1))))

Backtrace

dict-ref: no value for key: 'branch23083 in: '((x . binary64))		L	C
for-loop	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/points.rkt	106	4
make-sampler	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/points.rkt	99	0
prepare-points-intervals	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/points.rkt	121	0
for-loop	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	233	9
sindices->spoints	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	194	0
f33	/opt/racket-7.2/collects/racket/match/compiler.rkt	507	40
get-final-combination	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/mainloop.rkt	369	0
(unnamed)	/opt/racket-7.2/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.2/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.2/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.2/collects/racket/private/more-scheme.rkt	261	28

could not determine a ground truth for program body (more)

Reproduce

Backtrace