fa&a fubftitutione oritur 



3 



2(1 — z s fv{±z 3 — 1) vv(i—vf 



Fiat iam v = — — , et habebitur 1 — 2; ^^-^— et 1 — 31; 



+ 3 i;j;- I -^±^ ) nec non 3 y _ — ^-^. Quani b 



rem obiinebitur: 



3 3 



ldvV(i — 3 V-h3w) _ _ Pu(i-4-ti) j/(i-f-u 3 ) 



z; ^ ( 1 — *;) 2 uu 



_ Pu)/(i-f-u 3 ) , iait 1/(1 -hu 3 ) 



— --— ■ —r~ • 



uu u 



Horum membrorum pofterius manifefto eft integrabile, prius 

 vero evadit integrabile ponendo u — -^. 



3„ 



J. 5. Formula — - r. fi multiplicetur fupra 



et infra per i+x + xx, prodibit 



33 3 



3x/(i+x 3 ) dx\/(i ->-x 3 ) x^x/(i+x 3 ) 



I — x 1 — X 3 I — X 3 



xxSx/fi+x 3 ) 



I — x j 



Vbi cum pcftremum membrum fit integrabile , reftant inte- 

 granda bina reliqua membra, integrale prioris perficitur fub- 

 ftitutione x^^ x ~ y , prodit enim 



Nova Acta Acad. Imp. Scient. T. XI, E e d x 



