218 



a 3 



d x V ( i -4 - x 3 ) dyy 2 ( i -t- 3yy) 



i — x 3 y (3 -\-yy) 



3 3 



Dein ponendo y2 ( 1 +3yj)z:zy 4 habebitur 



3 3 



dyy 2(i-4-3yy) 9% 2 d%Y 4 



y( 3 +-J/) 2 ( 2 z 3 - 1 ) ( + •+- z 3 ) * 



3 



^ r 1/ ( 1 — - j yy j 



Sequitur hinc formulam — —1 . — l reddi rationalem fub- 



1 — x 3 



ititutione x 



/3 — t/(?% 3 — i) 



73 + ]/(:z 3 -i)' 



X ^ X V ( I ■+- X 3 } 



■J. 6. Integrale membri . ' variis modis 



1 — x 3 



•erai potexitj et quidem ope fubftitutionis x 3 :^ 1 " y reperitur 



3 3 



xdx}/(iH-x 3 ) ^dyyz 



y(i -+-/)/ (1 — y) 



X 3 



Qaam ob rem polito y (1 — y)~z cbtinebitur 



3 3 



\~dyy 1 zz'z/2 



/ ^ 3 // n (1 - s J )U — s 3 ) 



3 

 Ponendo autem y(i-+-x 3 )~| oritur 



3 

 xdxy t -+-x 3 d z 



I_X ' 2;(2^-i)k(i-2 3 ) 



id 



