[ 287 J 
4 °. Flu. A cof. TK+2 x fin. pA 
r axx + t* 
fin. verf. x — f»xA + i 
2 xx — f* 
Si fuerit A = p, erit cof. A A -J- dy cof A A = 
4, cof 2 A A d -j- JL cof dy &c. adeoque formula 
praecedentes in has abeunt, 
T^ f : - — : : ; r A fin. 2*A + d 
i°. Flu. A cof a A -f- d x cof A A = - — — 
4- —A. 
• -- - - 
2°. Flu. A fin. A A dy fin. A A == — 
. Cof. if/ . 
4 —A. 
1 2 
* 
3 °. Flu, A fin. A A -f - dy cof. A A = 
, fin. d . 
+ — A. 
• ,, - 
4°. Flu. A cof. a A d y fin. A A := 
fin. d . 
—A.. 
A 
fin. 2 xA + d 
fin. verf. 2xA-f-</ 
4* 
fin. verf. 2xA + </ 
' " 4* ~ 
PROPOSITIO I. PrOBLEMA, 
In fyftemate duoru m planetarum circa Solem in orbibus 
pens circularibus revolventium, requiratur vis plac* 
neta? exterioris ad perturbandum mot u in interioris. 
Revolvantur planet?e duo P et Q_(Fig. I.) in eo~ 
dem piano circa Solem in S, et juncrantur SP, S Q_ r 
Orbis 
