^66 D E M O T V 



fimili modo tertia abit in hanc formam : 



dS - • d S ^ ' 



fadlaque euolutione 



hoc eft 



M ^/^j -j' (/^ M = o fcu ^^ z=. 4JL> 



Ex his coniundis fit vt ante d dy zr. i y dy dS». 

 Quod fi hinc ftntim tubi formas algcbraicas elicere 

 "vehmus fumatur fuperior conllans m iz o ., >t fit 

 dy^yydS ideoque ^ r:i - S - ^ , lcu y — j[=f-^. 

 Tum aequatio Mdy~ydM.z:zA.dS dat 



ideoque 



•^^^— 3aa(aSH-e) *-•■ ^ ~ 3a(«s-f-g)~» 



ac deniquc araplitudo H— ^^^/^yj^ -^ prorfus vt 

 ante. 



S c h o 1 i o n 5. 



93. Practer hos duos cafus autcm , quibus 

 fbrma tubi vel cft algcbraica , vcl a circulo pcndct , 

 tertium non omitti conucnit, quo ea pcr qunntitatcs 

 cxponcntiales dctcrminatur. Pro co autem aequationis 

 d dy zz lydy d S integralc fumitur dy-dS[yy-vim) 

 Ynde fit 2 w S 4- a « — ^ y^ ^"^^ ^i^ 



tum 



