\[\left(\left(x \cdot y - y \cdot y\right) + y \cdot y\right) - y \cdot z\]

\left(\left(x \cdot y - y \cdot y\right) + y \cdot y\right) - y \cdot z

double f(double x, double y, double z) {
        double r8700 = x;
        double r8701 = y;
        double r8702 = r8700 * r8701;
        double r8703 = r8701 * r8701;
        double r8704 = r8702 - r8703;
        double r8705 = r8704 + r8703;
        double r8706 = z;
        double r8707 = r8701 * r8706;
        double r8708 = r8705 - r8707;
        return r8708;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (x y z)
  :name "Linear.Quaternion:$c/ from linear-1.19.1.3, D"

  :herbie-target
  (* (- x z) y)

  (- (+ (- (* x y) (* y y)) (* y y)) (* y z)))

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