3 12 
') o ( 35 
quo ipfo elimiRabitur orientur tandem qiiæfi- 
tæ illæ tres æquationes differendo- differentiales fo- 
lutionem problematis continentes, quas heic rc- 
præfcntare =convenit ut inde argumentari nobis li- 
ceat de hujus methodi indole , praeterea quod fpe- 
remus leftori attento & hujusmodi calculorum pe- 
rito haud dirpliciturum fore , quod invenerit 
fummam calculi maxime prolixi intra breves has 
paginas ea ratione ede exhibitam, ut hifce indiciis, 
adjutus eundem prorogare ipfe queat. Erit autem 
-aequatio prima formæ fequentis. 
ddx 
~dt 
2 (7/^ -f- i) dy 
dt 
— ^Cof. 2 P — ^JfGof. 2p 
-ff* -^y Sin. 2 p -l- ^ Çy^ ^ -{^6Xx 
iy' + — i^kx^ (y"" -i-z' ) + X(y^ 
-i^z^y — V ^x{y~ 4- y ’i~’]Xx^ — Xx"^ {y^ 
- 4 - z“') — ^ {y^ + — 1 77 ( 3 Cof. p 4- 5 Cof. 3 p) 
— iax (3 . Cof. p 4 - 5 Cof. 3 p) 4 - In y (^Sin. p 4 - 
5 Sin. 3 p) — fax^ ( 3 Cof p4- &c. ) 4- 1 tï ( Cof 
Sic.)— in y"" (Cof &c.) 4 - éTJZ-'' Cof p 4- |«(Cof 
&:c.) 4- (Cof &c.) -r- |;t}'(Cof &c.) 4- |^« 
(Cof &c.) + (Cof &c.) — laKy (Sin. &:c. ) 
4 - 3877 x.r^(Cof &:c.) — | (Sin. &c.) 4 -Î 77 ;«}'^ 
(Cof &c.) — lanz"^ fCof Sic.) 
Æquatio fecunda formae fequentis. 
ddy 1 ) dx 
— j», — — — — j_ ^ ^p 4“ Sin. 2 p 4“ 
dt^ dt ^ 
4)' Cof 2p-— ‘^Xxy -^GXx'^y — ÎXy {y^ 4- 2-) 
içTiX^y -h VA.rj ()'^ 4- z^ ) — loXx^y '^^Xxy 
(}'* 
