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

\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 r62048 = 1.0;
        double r62049 = Om;
        double r62050 = Omc;
        double r62051 = r62049 / r62050;
        double r62052 = 2.0;
        double r62053 = pow(r62051, r62052);
        double r62054 = r62048 - r62053;
        double r62055 = t;
        double r62056 = l;
        double r62057 = r62055 / r62056;
        double r62058 = pow(r62057, r62052);
        double r62059 = r62052 * r62058;
        double r62060 = r62048 + r62059;
        double r62061 = r62054 / r62060;
        double r62062 = sqrt(r62061);
        double r62063 = asin(r62062);
        return r62063;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019323 
(FPCore (t l Om Omc)
  :name "Toniolo and Linder, Equation (2)"
  :precision binary64
  (asin (sqrt (/ (- 1 (pow (/ Om Omc) 2)) (+ 1 (* 2 (pow (/ t l) 2)))))))

Backtrace

get-representation: Unknown representation real		L	C
(unnamed)	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	65	3
filter	/opt/racket-7.2/collects/racket/private/list.rkt	256	2
infer-splitpoints	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	34	0
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