\[\sqrt{\frac{1}{2} \cdot \left(1 + \frac{1}{\sqrt{1 + {\left(\frac{2 \cdot \ell}{Om}\right)}^{2} \cdot \left({\left(\sin kx\right)}^{2} + {\left(\sin ky\right)}^{2}\right)}}\right)}\]

\sqrt{\frac{1}{2} \cdot \left(1 + \frac{1}{\sqrt{1 + {\left(\frac{2 \cdot \ell}{Om}\right)}^{2} \cdot \left({\left(\sin kx\right)}^{2} + {\left(\sin ky\right)}^{2}\right)}}\right)}

double f(double l, double Om, double kx, double ky) {
        double r44030 = 1.0;
        double r44031 = 2.0;
        double r44032 = r44030 / r44031;
        double r44033 = l;
        double r44034 = r44031 * r44033;
        double r44035 = Om;
        double r44036 = r44034 / r44035;
        double r44037 = pow(r44036, r44031);
        double r44038 = kx;
        double r44039 = sin(r44038);
        double r44040 = pow(r44039, r44031);
        double r44041 = ky;
        double r44042 = sin(r44041);
        double r44043 = pow(r44042, r44031);
        double r44044 = r44040 + r44043;
        double r44045 = r44037 * r44044;
        double r44046 = r44030 + r44045;
        double r44047 = sqrt(r44046);
        double r44048 = r44030 / r44047;
        double r44049 = r44030 + r44048;
        double r44050 = r44032 * r44049;
        double r44051 = sqrt(r44050);
        return r44051;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019323 
(FPCore (l Om kx ky)
  :name "Toniolo and Linder, Equation (3a)"
  :precision binary64
  (sqrt (* (/ 1 2) (+ 1 (/ 1 (sqrt (+ 1 (* (pow (/ (* 2 l) Om) 2) (+ (pow (sin kx) 2) (pow (sin ky) 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