tumque C. 2a-t- 1 =2 C. a"; C. 2a — irr^S.a^; S. 2.a.-iS.aC.<st. 

 His igitur praenotatis nunc demonilratio noftra quoque hunc 

 in modum abfolui poteftj ob 



C. u — '--^ '''■%; erit cof.Cl) — ^-"•"; 

 fm.(h—L^i.^^if-=±^ et -^l^=-L^ — eC.u~i; 



~ cc.u — « i-h-ecoj.:^ 



quia igitur 



r — ^ — "(p"— '^ et / :=z °'^' — '' 



i-(-ccoJ.Cp j-f-ccoj. (p i-t-ecOj.Cp'' 



habebimus r -f- r^ = fl (^ ( C. « H- C. ?/) — 2) j fimilique mo- 



d9 ^ -l-f "■ = «(/ (C.i; -f- C. 'y'') — 2); idcoque pofito r-j-r^ 



— ^ ~J~ ? 9 erit quoque 



€(_C.u-hC.u')z:z / (C. -y -}- C. 1;') . 



Tum vero ob 



r' ^/^— zr r' cof.((p—(^')-f -^^^'— 2f ^' coC, (\p—\\^') ^ fit 

 r / cof. l {(p—(p'') — ^^' cof. I (v|y — v|y^O ; fiue 



(g^ — i)cof.|((I) — 00 _ (/^— i)cof.|(vjy — \|.0 

 y(i-(-f cof.Cp)(i-f-^cof.(pO ~ y(i^^^cof.\p)(i-+-^^cof.\i>0' 



quae in hanc transformatur: 



Clu Cl u^ (e— i) -i- S.Ui S.l u^ (e-h i) ~ 

 C.i-y C.^-y'^/— i)-hS.'^7S.§ ^"(/-+-1), id eft 

 €C.l(u-^u')-C.l{u-u') = e'C.l(v-^v')-C.l(v-i/), 



quare quum fit 



e (C. u -4- C. i/) = cC.l (u -H u') C l (u — «0 ^t 



/ (C. "y -f- C. v^) z=ie' C.\(v-^ v') Cl(v — v') , erit 



eCl(u-h «0 — e' C.l (v -{- v^ et 



C. l (u — wO =:Cl(v~ v') , 



Tndc 



