= (157) == 



Atqiie eiiolutis his acquationibus hnbcmus: 



i-f-^' — 2^(cof.?/-f-cor.//)-|-(i-|-f')cor.acor.«'-H 

 fin.wfiii.K'(i— ^MzriJlrl^rli^ — il: 



I -f- ^" — i ^' ( cof. 1' -h cof. i;') -t- ( I -i- f ' cof. -y cof. "/-f- 

 fin.c;fin.-/(i— /M^LlitJ'^— 5L. 



Hincquc fit 



I -f- 2 ^' cof. i (« H-"0* — - ^ ( cof. K-i- cof. uf) -J- 



C0f.(M — //)II1<J1±- 



( r ->- r' : 



/ '» 



a> 



H-2f^'cof.;('-j-f-i0* — ^f^^cof.-y-f-cof.--/)-!- 



cof.(i; — '■/)zrLL±pl-— 4-. 



Ideoquc ob u — u' rziv — v' ^ 



e ( cof. K-f-cof. u^) — / (cof. -y-f-cof. v^) ct 



KC0f.K«-+-"')=^^C0f.i(^-+-^') , 



Tt ex fupcrioribus conrtat; fit omnino (r-+-K)= — •^''-(f"*"?^)'' — <^^ 

 fiue J i:r 0", 



§. 14. Haec autem dcmonflnuio fcquenti qxioquc ra- 

 tione inftrui porell: Quia cft cof.K— '^'"'■^^; fit 



COI.,K i ct fin.iK- -L — { 



y{i-hccoi'.(p) y{i-h£coi'.(p) 



quibus fimiles formnc pro cof.jK^; fin.U^; cof.:'!;; cof.i^y^ ctc. 

 inuCiiicnruri quumque fit 



u — u' — v~rj' ct cof.!(K — K')z=cof.J(v — vO? 

 nec ron 



fip.!(K — K^)=ifin.'(i; — 1-0, 

 indc fcqucntcs colligentur aequationes: 



V 3 eof. 



