126 ' 



v*=i — ^ z z -}- z^ et 



v^dv:=: — 5 zdz-^-z^ dzz=:zd z{%z — 3), 

 abibit in fcquentem tbrmam: 



qua euoluta prodit denique 



(i— zz)l/(i — ^zz-hz'^)^ 

 Haec igitur formula cum propofita formula differentiali fu-, 

 perioris problematis prorfus conuenit, ita vt certi fimus hu- 

 ius formulae integrale reuera effe 



V =z ? Z ^-^<^-"-'^ — A tans;. ^ , 



etiamfi non pateat, quomodo hoc integrale methodo dire£la 

 elici queat. 



EVO- 



