; seed : #(1062930989 876886121 3990119081 3032829768 3060892583 1929069376)

; flags :
;   rules      = (arithmetic polynomials fractions exponents trigonometry hyperbolic)
;   setup      = (simplify)
;   generate   = (rr taylor simplify)
;   reduce     = (regimes taylor simplify avg-error)
;   precision  = (double)

; timed out
(FPCore (R lambda1 lambda2 phi1 phi2)
  :name "Equirectangular approximation to distance on a great circle"
  (* R (sqrt (+ (* (* (- lambda1 lambda2) (cos (/ (+ phi1 phi2) 2))) (* (- lambda1 lambda2) (cos (/ (+ phi1 phi2) 2)))) (* (- phi1 phi2) (- phi1 phi2))))))