(205) == 



Deinonftratio. 



I. Cum fit 



I -+- A- H- jr' -f- jf' -4- j»r* -f- etc. ~ -— ,' 

 multiplicando per d x et integrando erit: 



» * „ / I __ jc 



vnde pofito jc n: i nafcitiir prima feries: 



A =: I H- 1 -H I -h I -+-.... 1 —/ 5 , 



11, Porro cum fit 



4« 



A-4-Bzz:j^-f-r-4-*_^-^?L*H- . . . . 1_ et 

 A r= a:-i-^'-+- ^-+-5.* -+-... . ^\ 



3 4 ;2 ' 



fumto fciHcct jf— I, fi in hac poftrema ferie loco x fcriba- 

 tur jf', quod , quia deinceps vbique loco x vnitas fcribitur , 

 fine vllo dubio licet, prodibit 



A =r A-* -I- *-* -h ?! H- *- -h . . . . —^ 



* 3 4 „ 



qua ferie ab illa pro A H- B affumta fublara remanet 

 B =: jc — e-h ^^ — ^* -h ^ — ^' -I- etc. 



» 3 4 ' S i ' 



ita vt pofito jf — I liabeamus : 



B = I — -i -h i — ;i -t- i— IH- etc. ir: / 2 , 

 confequenter : 



-i-4--L_-h_L_-h-^-f- . . . . i-=:/i% 



n-Hi n-H2 n-(-s n -(-4 »n ^ 



111. Eodcm modo cum pofito x — i fit 



Cc 3 A-^ 



>u 



