\[\tan^{-1}_* \frac{\sin \left(\lambda_1 - \lambda_2\right) \cdot \cos \phi_2}{\cos \phi_1 \cdot \sin \phi_2 - \left(\sin \phi_1 \cdot \cos \phi_2\right) \cdot \cos \left(\lambda_1 - \lambda_2\right)}\]

\tan^{-1}_* \frac{\sin \left(\lambda_1 - \lambda_2\right) \cdot \cos \phi_2}{\cos \phi_1 \cdot \sin \phi_2 - \left(\sin \phi_1 \cdot \cos \phi_2\right) \cdot \cos \left(\lambda_1 - \lambda_2\right)}

(FPCore (lambda1 lambda2 phi1 phi2)
 :precision binary64
 (atan2
  (* (sin (- lambda1 lambda2)) (cos phi2))
  (-
   (* (cos phi1) (sin phi2))
   (* (* (sin phi1) (cos phi2)) (cos (- lambda1 lambda2))))))

double code(double lambda1, double lambda2, double phi1, double phi2) {
	return atan2((sin(lambda1 - lambda2) * cos(phi2)), ((cos(phi1) * sin(phi2)) - ((sin(phi1) * cos(phi2)) * cos(lambda1 - lambda2))));
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2021067 
(FPCore (lambda1 lambda2 phi1 phi2)
  :name "Bearing on a great circle"
  :precision binary64
  (atan2 (* (sin (- lambda1 lambda2)) (cos phi2)) (- (* (cos phi1) (sin phi2)) (* (* (sin phi1) (cos phi2)) (cos (- lambda1 lambda2))))))

Backtrace

simplify-batch: contract violation expected keyword argument #:precompute in: (-> (listof (or/c (listof any/c) symbol? value? real?)) #:precompute boolean? #:rules (listof rule?) (listof (listof (or/c (listof any/c) symbol? value? real?)))) contract from: (function simplify-batch) blaming: <pkgs>/herbie/core/simplify.rkt (assuming the contract is correct) at: <pkgs>/herbie/core/simplify.rkt:68.18		L	C
raise-blame-error	/opt/racket-7.9/collects/racket/contract/private/blame.rkt	347	0
for-loop	/opt/racket-7.9/collects/racket/contract/private/arrow-higher-order.rkt	508	13
kwd-checker	/opt/racket-7.9/collects/racket/contract/private/arrow-higher-order.rkt	496	11
connected-components	/data/pavpan/nightlies/herbie/egg-interface-fixes/src/symmetry.rkt	17	0
run-improve	/data/pavpan/nightlies/herbie/egg-interface-fixes/src/mainloop.rkt	387	0
(unnamed)	/data/pavpan/nightlies/herbie/egg-interface-fixes/src/sandbox.rkt	54	6
run	/opt/racket-7.9/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk	/opt/racket-7.9/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.9/collects/racket/engine.rkt	42	24