MOT US MED 1 1 Plan ETA RUM. 2,7 



, , ndP(iq-\-(l~^-qq)cofx) n p (d Q — d R) cof. x 



1*. A — u tp ■+•  —  ,. • 



p q qfin. X q q fin. x 



XXXIV. 



Jam vero cum fit d P = v ' d <p fin. a (- — — J j 

 eric primo variatio in femi-parametro p produ&a: 

 dj> = — i«v' d<pfin.<r (^ — ^-J- 



TN-i 1, q vvdqfin. x 



Deinde ob d v = . 



P * 



ent d Q = — —  , & 



in /q uvdttfin.x cof ? . ~ \ f u  \ . 



^ = [I L '--.yd* fit.*) {7-Tu)> 



unde pro variatione femi-axis tranfverfi r pepericur: 



dr — 1 n qv< 4 Q) fin. x , f q v fin x cof. f r \ 



— == — ■+• 1 nvd® [ —  — — {in.tr} 



rr pT< \ P J I 



(ri "~ Tu)' 

 Turn vero relatio inter d <p & dx prodit : 



, , n v ' d <Sf {1. q -f- ( I -+- q q cof. x) fin. a / u 1 \ 



a x = d <p ■+■ - I — — — I 



pqq fin. X \t 1 u 11} 



nv l dy npvdqcofixfin.'fu 1 \ nvvdfcof. x cofi p 

 jt' qqfin.x \ri uuj q 



\t ' uuj * 



ubi meminifle oportet effe v ss — : 7—* 



* l~\~q cof. X 



Dij 



