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

Math

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

C

double f(double r, double a, double b) {
        double r758153 = r;
        double r758154 = b;
        double r758155 = sin(r758154);
        double r758156 = r758153 * r758155;
        double r758157 = a;
        double r758158 = r758157 + r758154;
        double r758159 = cos(r758158);
        double r758160 = r758156 / r758159;
        return r758160;
}

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), A"
  (/ (* r (sin b)) (cos (+ a b))))

Backtrace

hash-ref: no value found for key key: #<enode 394(394)>		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