fitio z — ~-^. ,^l'Z cp 1 fiibfiftere nequeat, pofito aiitem 



y ( X — e-) J"- ^ g-f-eo/. v|/ 



^ '' 1 -i- e co/. 4) V ( I 4- : e co/. \p -+- e' J ' 



fit diifcrentiando : 

 et multiplicando per 



V( ■ -f- 2Pro/.(p-f-e- ) I -f- e cof. yjj '^ 



e-t-co/.cp /rn.v|/V(" — e^; ' 



^^y(i+2fconcp+^')_ </vi>. (i+ gcor.\{y)' 



nec non 



z J g ? d (p V ( 1 -t- I e f o/. (|) -H e ^ ) 



V ( I — 71 z sj ~m ' ( I -+- e co/. CP ]« 



^ ^ \jy ( I •+■ f cof ^4^ ) * • 



;«(i-^') (i-f2^cof vly + ^')' 

 At eft I - r- := „-^ , hinc m{i- e^) ^ , et cafu m 

 infiniti, fit ;;/ ( i — e^- ) — n^ ideoque 



zdz _ ^v|y(i+cof v{y)' 



y(i-;2x:xj) — »(2(i_f-cof v|.))^ 

 zr — ^.cofjvp ob tfrri, exiftente 



_ J_ /'-. $ e V ( I — f * ) Ji?-^L e-f-co/.\J/ 



Vi ' ' -+- e co/. ^P yre ■ 1 -|-eco/.(p e V n( ' -f- jt cq/. \['-+- e') ' 



y 2 « y ;i 



Caeterum binae hae redudiones iam quoque direcfle ex §. i8. 

 etip. deduci poffunt. Denique differentiale ^^^—^^ reduci- 

 tur ad formulam noftram XI. §. aa , ponendo e — o, 



crit- 



