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

\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 r8566 = 1.0;
        double r8567 = 5.0;
        double r8568 = v;
        double r8569 = r8568 * r8568;
        double r8570 = r8567 * r8569;
        double r8571 = r8566 - r8570;
        double r8572 = atan2(1.0, 0.0);
        double r8573 = t;
        double r8574 = r8572 * r8573;
        double r8575 = 2.0;
        double r8576 = 3.0;
        double r8577 = r8576 * r8569;
        double r8578 = r8566 - r8577;
        double r8579 = r8575 * r8578;
        double r8580 = sqrt(r8579);
        double r8581 = r8574 * r8580;
        double r8582 = r8566 - r8569;
        double r8583 = r8581 * r8582;
        double r8584 = r8571 / r8583;
        return r8584;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (v t)
  :name "Falkner and Boettcher, Equation (20:1,3)"
  (/ (- 1.0 (* 5.0 (* v v))) (* (* (* PI t) (sqrt (* 2.0 (- 1.0 (* 3.0 (* v v)))))) (- 1.0 (* v v)))))

Backtrace

get-representation: Unknown representation #f		L	C
loop	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	122	4
prepare-points	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	146	0
setup-prog!34	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	67	0
run-improve43	/data/pavpan/nightlies/herbie/interface2/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