^ x'^ d X 

 Pro formiila autem / . _ tx- — iiuegranda llatuamu? 



-^ zir/, fietqiie hinc .v ~ -J-^ ct ^ — ^^^^3;^, idcoque for- 



mula noflra euadet / ^ , ~ j ^'bi notetur, cafu ;t; = o 



fore j/ — o , at cafu x — i forc j ~ 00 , ita vt hoc inte- 

 grale a termino y — o vsque ad terminum y — 00 capi 

 oporccat. Quia nunc cxponentem X vt fradum fpedamus, 



ponamus X =: '^» et formula integralis ctit fL—L.ll . Hic 

 flatuamus porro j — z\ vt fit 



j ' zi;::'^"' et dy — y z*'' d z ^ 



z"--'dz ^ 

 vnde formula intcgrahs erit v/ — T~- De hac autem for- 



mula notum eft , eius integrale a tcrmino z rzo vsquc 



nd z-oo effe zz ^ — ^^; quocirca, quoties fuent 



pzz. — n et ^— I — « — -!^, 

 tiim valor noflrac formulac integrahs erlt 



/^f-^^.v(i-.v>-^''-' ^liiT'^. 

 vnde fequens problcma refohicre poterimus. 



Problcma. ' 



§. 39. Propofita hac ferie : 



