proinde 



200 



., = $ + Arc.tangJ-^;^S 



t^^g^-^^-^^CT-' - ^(^-Ct))tang(|)-^(^-(!)^i 



tang co - ^ ^^^a-^^^^^- ^(^_cp)-[(a-:pf-i]tangCl) 



— ^(^— ^)fii^^- +[(^ -^)"-^]cQf0 

 ~2(a-q)cof$-[((i-Cl))2-i]finCp' 



unde ob tang w = u = ^ ^ et 



X = b [2 (a - ([)) cof $ - [(a - (pf - 1] fm ([)] , 

 nancifcimur 



-f z= 2 (a —- Cf)) fin $ -4^ [(a — (pf — i] cof Cp. 



Sumtis utrinque quadratis, lit 



-.Ji^ — ^(a — (pf -h(a — (py— 2 (a — ^Pl-^- 1 



- [(a ~ (pf -h if, 

 feu pofito 



>/(xx + 7/)-2, (a — Ct)f = »-=i, 

 unde reperitur 



a — Cf)=i:/^, et b Cp z- a b — /(b 2 — b b) ; 

 iicque aequatio ad arcum fupra inventa 



sz:zc — h(p-\-tL^fi^, 

 abit in fequentem 



^zzc — ab4-/(bz — bb)H-|/ '^^ 



=:c--ab + lA±i^V(z~b), five 



^\y = c — ab + ^-^-^^V;'"-^': 



31/6 ' 



quae expreffio cum. ea^, quam fupra (J. 3.) invenimus. 



Ij/ I ( g^-f- g) -/(2 z — a') 



' pror- 



