vbi fignum fiiperius valet, fi k fiierit nnmerus impar, in- 

 feriiis aiitem fi k fiierit numerus par. Ponamus porro ad 

 hanc feriem fummandam 



T zr cor. "^^ - cof. '-^^ 4- cof ^^ - cof. '^ 

 -t-. . . . '!-f-cof.tlr:-,;l2-?, 

 ita vt hoc valorc T inuento futurum fit 



2 S cof. ^ = I - ^, :!: ^ cof. « tH ^ . 

 Multiplicemus fimili modo vtrinque per 2 cof ^J, et in fub- 

 fidium vocata eadem redu(flione reperietur : 



+ cof i^ - cof. ^" 

 ■ cof. ^^ - cof i-7 + cof. i^ 



C -h coi. ^" — coi. '^ 



2Tcof. "-;^=) '" '* 



4-coC'-^ -4- cof. f*''-'' 



- cof ^ 



vbi omnes termini fe mutuo deftruunt, prjcter primum 

 inferiorem et vltimum fuperiorem, ita vt obtineamus : 

 2 T cof 'l; = cof i;; T cof (i1::l ■)JL- 



Qnia autem 

 (ife_— 



ife 



Cof ^^^•i^'^ = Cof «TT COf }^ + fin.WTT fin.^-^'', 

 qnoniam vero « fupponitur numerus integer, erit 



fin. n Tt = o, idcoque 



2 T cof. "J zr cof ^ J Hr cof. ;; tt cof ^^, 

 vnde fit 



T z:r. 5 H~ .' cof « t, quo valore fubflituto fict 



2 S cof '^ — I, confequenter 



