== (6o) = 



Exemplum. 



§. 29. Sk fgitiir ^ — I et ^zzi, ideoque <" zn J, ct 

 quatiior formulae intet^rales eruut: 



=/^."Q=/t-^ 



/(i-A-/ -j/(i_;,;^ 



V(i—x) /(i_.v) 



quae formulae vt ab exponentibus fradis liberentur, ftatuatur 

 *■ ~ J^ critque 



/(i-y/ *^ /(i-rV 



>/(l-j3) -^/(x^J^) 



ex quibus valoribus fit 

 vbi uotetur efle 



/v^ = j/ 



§. 30. lam fingulas iftas formulas accuratius euolua- 



/f) y 

 ad circulum re- 



duci poteft. Pofito enim '- — z , formula noftra 



Vii-r) 



fit 



