(75) 



•vnde ergo deducitiir 



V. / — : / 3= tang. 



/ ■/(^i^x''') J ■/(i-x^'') ^^a 



§. 2 2. Pofllimus etiam valores littcrarum l? ct c inter 

 fe permutare , vtfit^z=:2aet(r— 2« — 2^, manentibus 

 a~& et 7J~4.a; tum autem fiet 



p — f£ll!ZlAl. et o — Z ' ^""'^-y 



~~y (l _j^4aAa+_fl ^ ^—7(1 _j^.4a-)a+j9 



hincque deducitur redu(flio 



V I. / —3 : / ^, rz: tan^. — . , 



quae autem, aeque ac pniecedens, locum non habet , nifi fit 



§. ?.3. • Quod fi autem ^ fuperet a, aequationem no- 

 flram in aliam formam transfundi oportet, figna Ytrinque mu- 

 tando 5 vnde prodibit 



rx^''-^-'dx (l — .V^^-"-«)Cl — J^"-«) , TT 



/ . i — l cot . 



J IX I— x-*°' 4a 



Hic iam iterum duplex comparatio infiitui potcfi: primo fcili- 

 cet fumamus a ziz 2 a — ^, b ziz 2 ^ — 2a, c zzz 2 a et 

 « ~ 4. a , vnde formamus 



»/1/(1— .v^«) ^ J >/(i— A-^°'; 

 hincque oritur fcptima relatio haec : 



VII. f^lZlljL. : f^-'-'-S.r ^ ^„^, Sj. 



JV(ii—x-*^)J Y(i—x^'') 4a 



quae manifeflo cum quinta congruit. 



K 2 ' §• 24. 



