72 DE SERIEB. QVIBFSD, CONSIDERJT, 



par, fummae per quadratiiram circiili poterunt inueniri p 

 atque ex iam inuentis fummis fimiiium poteftatum pari- 

 um pro numeris imparibus (olis. Veriim \t hae fummae 

 direde inueniri queant , in legem peculiarem qua iftae 

 iiimmae progrediuntur , inquiramus. Sit itaque 





etc. zz A TT* 



♦ -f- etc. iz: B TT* 



« -f- etc =: C TT* 



, -H etc. =: D 71* 



etc- 

 «c contemplabor hanc feriem : j ^ * 



quae fubftitutis loco A tt* , B 7r* , C ti* , etc. leriebus 

 quas denotant , additisque terminis homologis , prodibit 



. ZX ZZ_ ZZ ZZ Z7i . 



«» — j-az "* 4-»« *« 9-»a "T^ 16-2» •" ii-zz t" ^^^* 



quae feries per §. 17. fummata dat j — | ~ 1 ^^^ :^ 

 vel fi tangens arcus 7r 5; per feriem exprimatur : 



I ^ ?li^ _+_ '"*^L. — "^*^! L. etc 



1»— ~ t _„ I Ij. 2 ' 1.2. 3.4 1.23 . 4- -.ff "^ '-*-^* 





■^ rT:^ • I.2.3.*.-. 1.2..., 7 ^ "^* 



m^z* 27r* ♦ I j-rr* x« _ +11» z» i_ g^^ 



1.2^3 1.2.3.+.5 ' 1. •.■•7 I. 2. . ■ 9 



1.2.3. 4.S 1.2. ..7 ' i.a...9 tiH,. 



qua exprelfione euoluta , cum ipfam (eriem afliimtam 

 A TT* js* -i- B TT* 5;* -H C TT* 2* -h D 7r" 5;' -{- etc. prae- 

 bere debeat , fequentur hae coefficientium determinationes 



A 2 



I.2.S I. 2 3. 4. 5 



C B. — J^ L. ll. 



1.2.3 1.2.3.4.5 ' I. *. 

 T^ -— JC B L_ A 



I. ft3>4.S ' i.a....7 i.a. .^» 



etc. f 1%' 



