\[\lambda_1 + \tan^{-1}_* \frac{\left(\sin theta \cdot \sin delta\right) \cdot \cos \phi_1}{\cos delta - \sin \phi_1 \cdot \sin \left(\sin^{-1} \left(\sin \phi_1 \cdot \cos delta + \left(\cos \phi_1 \cdot \sin delta\right) \cdot \cos theta\right)\right)}\]

\lambda_1 + \tan^{-1}_* \frac{\left(\sin theta \cdot \sin delta\right) \cdot \cos \phi_1}{\cos delta - \sin \phi_1 \cdot \sin \left(\sin^{-1} \left(\sin \phi_1 \cdot \cos delta + \left(\cos \phi_1 \cdot \sin delta\right) \cdot \cos theta\right)\right)}

double f(double lambda1, double phi1, double __attribute__((unused)) phi2, double delta, double theta) {
        double r9144496 = lambda1;
        double r9144497 = theta;
        double r9144498 = sin(r9144497);
        double r9144499 = delta;
        double r9144500 = sin(r9144499);
        double r9144501 = r9144498 * r9144500;
        double r9144502 = phi1;
        double r9144503 = cos(r9144502);
        double r9144504 = r9144501 * r9144503;
        double r9144505 = cos(r9144499);
        double r9144506 = sin(r9144502);
        double r9144507 = r9144506 * r9144505;
        double r9144508 = r9144503 * r9144500;
        double r9144509 = cos(r9144497);
        double r9144510 = r9144508 * r9144509;
        double r9144511 = r9144507 + r9144510;
        double r9144512 = asin(r9144511);
        double r9144513 = sin(r9144512);
        double r9144514 = r9144506 * r9144513;
        double r9144515 = r9144505 - r9144514;
        double r9144516 = atan2(r9144504, r9144515);
        double r9144517 = r9144496 + r9144516;
        return r9144517;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 
(FPCore (lambda1 phi1 phi2 delta theta)
  :name "Destination given bearing on a great circle"
  (+ lambda1 (atan2 (* (* (sin theta) (sin delta)) (cos phi1)) (- (cos delta) (* (sin phi1) (sin (asin (+ (* (sin phi1) (cos delta)) (* (* (cos phi1) (sin delta)) (cos theta))))))))))

Backtrace

hash-ref: no value found for key key: #<enode 75(75)>		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

unused variable phi2

Reproduce

Backtrace