\[\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}\]

\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}

double f(double F, double B, double x) {
        double r7984 = x;
        double r7985 = 1.0;
        double r7986 = B;
        double r7987 = tan(r7986);
        double r7988 = r7985 / r7987;
        double r7989 = r7984 * r7988;
        double r7990 = -r7989;
        double r7991 = F;
        double r7992 = sin(r7986);
        double r7993 = r7991 / r7992;
        double r7994 = r7991 * r7991;
        double r7995 = 2.0;
        double r7996 = r7994 + r7995;
        double r7997 = r7995 * r7984;
        double r7998 = r7996 + r7997;
        double r7999 = r7985 / r7995;
        double r8000 = -r7999;
        double r8001 = pow(r7998, r8000);
        double r8002 = r7993 * r8001;
        double r8003 = r7990 + r8002;
        return r8003;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (F B x)
  :name "VandenBroeck and Keller, Equation (23)"
  (+ (- (* x (/ 1.0 (tan B)))) (* (/ F (sin B)) (pow (+ (+ (* F F) 2.0) (* 2.0 x)) (- (/ 1.0 2.0))))))

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