214 



o *» * 



ncicuiiauufj 111. t/ Jt - 



jie refultabit 



Cum vero dilTerentiando fit 3xz: - 2 *?' . , fafta fubftitutio* 



i./ T J- /" 



^X df 



( * -+- x) / ( i — X 3 ) / / - ( i -4- 3 / /) 

 id q od manifefto eft integiabile , nam ponendo ulteriuS 



3 



j/(t + 3//) — z evadit foimula rationalis 



3—zbz 



z 3 - i 



y /~{< -t-3/r) 



cuius adeo integratio eft in poteftate. 



f. 3. Formula — fi multiplicetur 



( i -+- x) V (i x ) 

 fupra et infia per i — x ~h x x prodibit 



? x d x x? x 



(n-x^yV-x 1 ) (i-+-x)i (i-x) (i-j-x ) f (i-x 3 ) 



X .V 3 X 



(l-+-X 3 ) \ (1— x 3 ) 

 Hinc fequitur inregrabilem quoque tiie formulam 



x d x 



m . — . —- ■ — ■ . m ■ ■ ■ » 



(i-4-x 3 ) ]/(i— x 3 ) 

 Si fiat uf-is fu.bftitutionis fupra adhibitae^ deducimur ad bi- 

 nas formilas , quarum. quaelibet pt cuJiaif m requnit evolu- 

 tionem, tma vero opeialione iniegutle iilius obtinebi ur po- 



nendo 



