\[\frac{1 - 5 \cdot \left(v \cdot v\right)}{\left(\left(\pi \cdot t\right) \cdot \sqrt{2 \cdot \left(1 - 3 \cdot \left(v \cdot v\right)\right)}\right) \cdot \left(1 - v \cdot v\right)}\]

\frac{1 - 5 \cdot \left(v \cdot v\right)}{\left(\left(\pi \cdot t\right) \cdot \sqrt{2 \cdot \left(1 - 3 \cdot \left(v \cdot v\right)\right)}\right) \cdot \left(1 - v \cdot v\right)}

double f(double v, double t) {
        double r177239 = 1.0;
        double r177240 = 5.0;
        double r177241 = v;
        double r177242 = r177241 * r177241;
        double r177243 = r177240 * r177242;
        double r177244 = r177239 - r177243;
        double r177245 = atan2(1.0, 0.0);
        double r177246 = t;
        double r177247 = r177245 * r177246;
        double r177248 = 2.0;
        double r177249 = 3.0;
        double r177250 = r177249 * r177242;
        double r177251 = r177239 - r177250;
        double r177252 = r177248 * r177251;
        double r177253 = sqrt(r177252);
        double r177254 = r177247 * r177253;
        double r177255 = r177239 - r177242;
        double r177256 = r177254 * r177255;
        double r177257 = r177244 / r177256;
        return r177257;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019323 
(FPCore (v t)
  :name "Falkner and Boettcher, Equation (20:1,3)"
  :precision binary64
  (/ (- 1 (* 5 (* v v))) (* (* (* PI t) (sqrt (* 2 (- 1 (* 3 (* v v)))))) (- 1 (* v v)))))

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