\[\sin^{-1} \left(\sqrt{\frac{1 - {\left(\frac{Om}{Omc}\right)}^{2}}{1 + 2 \cdot {\left(\frac{t}{\ell}\right)}^{2}}}\right)\]

\sin^{-1} \left(\sqrt{\frac{1 - {\left(\frac{Om}{Omc}\right)}^{2}}{1 + 2 \cdot {\left(\frac{t}{\ell}\right)}^{2}}}\right)

double f(double t, double l, double Om, double Omc) {
        double r3122419 = 1.0;
        double r3122420 = Om;
        double r3122421 = Omc;
        double r3122422 = r3122420 / r3122421;
        double r3122423 = 2.0;
        double r3122424 = pow(r3122422, r3122423);
        double r3122425 = r3122419 - r3122424;
        double r3122426 = t;
        double r3122427 = l;
        double r3122428 = r3122426 / r3122427;
        double r3122429 = pow(r3122428, r3122423);
        double r3122430 = r3122423 * r3122429;
        double r3122431 = r3122419 + r3122430;
        double r3122432 = r3122425 / r3122431;
        double r3122433 = sqrt(r3122432);
        double r3122434 = asin(r3122433);
        return r3122434;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 
(FPCore (t l Om Omc)
  :name "Toniolo and Linder, Equation (2)"
  (asin (sqrt (/ (- 1.0 (pow (/ Om Omc) 2.0)) (+ 1.0 (* 2.0 (pow (/ t l) 2.0)))))))

Backtrace

hash-ref: no value found for key key: #<enode 1549(1549)>		L	C
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	197	2
extractor-extract	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	196	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	35	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	217	0
run-iter!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	320	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	354	4
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	339	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28