192 DE CRITERIIS INTEGRABILIT. 

 certe adipifcimur 



^ d X ^ ci X' dx^ 



Pro podcriori criterio habemiis 



Dc reliquis formulis , quas integrabiles eflfc oportet , 

 periculum nunc quoquc facere iubct , habebimus 

 a tcm : 



f\<i.dx-f{-'-^^V-^-f!-\-'-^+'^'-^-'^dy) 



fdxf\^dx-f{-'-^^-\-t^)--^-f^ 



Porro 



/ P ^ .V =z/(- 1^^-^'^-li^ - ^^)=:-^+/^ 

 ideoque 

 f^'''^dx-f^''?dx-\-f(ldx-=zfe^-^-^JL^J)-/^ et 



j^^-^^dx-f^^^Vdx-^f^^^^ldx-fKdxz^o. 



Vlterius erit 



f^-'?dx-zfqdx-f{- ^ + ~J'^-~ et deniquc 



/ *> ? d X - ^ ) ^^ (^d X -\- :i fK d X ^ o. 



15. Dum cxcmpla iam propofituri crimus 

 formulurum uifftrcntrahum , quac pcr lc intc^rabilcs 



non 



