\[\left(x \cdot \cos \left(\frac{\left(\left(y \cdot 2 + 1\right) \cdot z\right) \cdot t}{16}\right)\right) \cdot \cos \left(\frac{\left(\left(a \cdot 2 + 1\right) \cdot b\right) \cdot t}{16}\right)\]

\left(x \cdot \cos \left(\frac{\left(\left(y \cdot 2 + 1\right) \cdot z\right) \cdot t}{16}\right)\right) \cdot \cos \left(\frac{\left(\left(a \cdot 2 + 1\right) \cdot b\right) \cdot t}{16}\right)

double f(double x, double y, double z, double t, double a, double b) {
        double r9033 = x;
        double r9034 = y;
        double r9035 = 2.0;
        double r9036 = r9034 * r9035;
        double r9037 = 1.0;
        double r9038 = r9036 + r9037;
        double r9039 = z;
        double r9040 = r9038 * r9039;
        double r9041 = t;
        double r9042 = r9040 * r9041;
        double r9043 = 16.0;
        double r9044 = r9042 / r9043;
        double r9045 = cos(r9044);
        double r9046 = r9033 * r9045;
        double r9047 = a;
        double r9048 = r9047 * r9035;
        double r9049 = r9048 + r9037;
        double r9050 = b;
        double r9051 = r9049 * r9050;
        double r9052 = r9051 * r9041;
        double r9053 = r9052 / r9043;
        double r9054 = cos(r9053);
        double r9055 = r9046 * r9054;
        return r9055;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 +o rules:numerics
(FPCore (x y z t a b)
  :name "Codec.Picture.Jpg.FastDct:referenceDct from JuicyPixels-3.2.6.1"

  :herbie-target
  (* x (cos (* (/ b 16.0) (/ t (+ (- 1.0 (* a 2.0)) (pow (* a 2.0) 2.0))))))

  (* (* x (cos (/ (* (* (+ (* y 2.0) 1.0) z) t) 16.0))) (cos (/ (* (* (+ (* a 2.0) 1.0) b) t) 16.0))))

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