Exception for r*sin(b)/cos(a+b), B

Math

\[r \cdot \frac{\sin b}{\cos \left(a + b\right)}\]

C

double f(double r, double a, double b) {
        double r726987 = r;
        double r726988 = b;
        double r726989 = sin(r726988);
        double r726990 = a;
        double r726991 = r726990 + r726988;
        double r726992 = cos(r726991);
        double r726993 = r726989 / r726992;
        double r726994 = r726987 * r726993;
        return r726994;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 
(FPCore (r a b)
  :name "r*sin(b)/cos(a+b), B"
  (* r (/ (sin b) (cos (+ a b)))))

Backtrace

hash-ref: no value found for key key: #<enode 435(435)>		L	C
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	197	2
extractor-extract	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	196	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	35	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	217	0
run-iter!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	320	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	354	4
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/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