43:: DE PERTVRBATIONE MOTVS 



ex quibiis valores vtriiisqne incognitae x et y defi- 

 niri oportet. Hunc in fincm fbrmularn imuionalcm 



{{i -\- xf-^ry y)' in feriem conuergentem rcfolua- 

 nius , quae eft 



1 ^-y y jL^ 'J- >*■ 



et quum porro fit 



I — 8 A: + ~T7T~ -^ ~ 77T~z X 





fj(SVa euolutione binae noftme acquationcs fequcntes 

 induent formas : 



^ 5 A.-* - 1 5 .V a:;'J' -H ■/ )*zzo 



- 10. A-'j -f ", .Vj' — o 



quac ferics quum a* et y fint fratftioncs (luis pnrunc 

 vehementer conuergunt , quod quo clarius appaiear, 

 has acquationcs in mcmbra .dMpetcuimiis Itcundum 

 ^imenfionum luimcrum , quas binae litterae .v ct y 

 adimplent. Ac prima quidcm ncmbra vocabimus 



principalia , fcquentia vero anncxa. 



• 



lo. Facilc hic pcrlpiccre licet quantitatcm .v 

 per certam feriem cofinnnm cxj^rimi ^icbcre, altcram 

 vero y pcr fi iiilcm lcr cm fmuurn , hinc in fubfi- 

 dium foiutionis oblcruairc iuiiabit, i\ mcmbra anncxa 

 prioris aequationis contincaiu ^J cof /jl t , poftcrioris 



vero 



