= (57) == 



-h 12 %* -h 2j^.ct.p-i-2^ay-+- 2^aS -^ 2^ a e -+- etc. 



H- 8 -t' -+-i^f3(3-H-4.(3yH- 24p5-4- ctc. 



-i-z^aft-h^^aay-hi^yy-h- ctc. 



-4-24a|3j3-+-24aa'^-»- etc. 



-+-4Sa (3yH- etc. 



-t- 8 (3' -f- ctc, 

 quac fcries acqiialis efTc dcbct j- — tHl . 



..§.21. Hiicc igltur fcries acqualis ftatui debet idi: 

 -.. ^r:::^.*- a//-(- (3 f^-i-y/*-+- 0/' -+- f^"-i-^/'-Ti->] ;'■♦-(- ctc. 

 ' '— '-ff-i^'^-»^— 4-3-4f3-4-5-<JV-+-7-5^-+-9-io;-4.ii.i26;-etc. 

 Tndc deducuntur fctjucntcs detcrminationcs : 



4. 1 . 2 a -h k ~ c j 



4. 3. 4r3-t- 5arz c ; 



4. 5 . 6 y -+- 5 (3 -4- I 2 a' — o ; 



4. 7. 8 5 -t- 5 y -4- 24 a (3 -I- 8 a^ = O j 



4. <?. iO£-H 55-H 24ay-H 12(3 [3h- 24a a|3 =:o. 

 etc. 



§. 22. Quoniam vcro liac rcJationcs multo mat^is fi?nt 

 complicatac quam c:ic ad quas prinio fijimis pcrdudti, illis po- 

 tius iniiacrcamus carumquc cuolutioncm fcqucnti modo fublc* 

 Ycmus. Ponamus fcilicet 



^ = 7^' (^ = -^^' y^-:^^ ^ = -^r„ er-^,, ctc/ 

 vndc fummatio noftra induct hauc formam: 



T =: ^X — *- . i^.^- -^ A . -:ii — '■_ 'ZlJ^ ^ » ili _ rtc 



Noua Aita Acad. Itf/p. Sf. T. II, H 



ae 



