ExenipiLim. 



6, 15. Eiioliiamiis icitiir cafiim quo -, — ' —2, 



j-' o ^ y{aa — cc' ' 



fiue c — —^-: i\c cnim fiet -/(aa — c c) zzt a, hincquc porro 

 w r^ 2 A tang -^'"■^ ^,, — A tang. , /- ^"'- '^ ^, . 



Gum igitur in genere fit 2 A tang. r r: A tang. ^-l^ , noftro au- 

 tcm cafii fit r — ^/'"•'^^ . . erit 



o A tang. -^'"•f . =1 A tang. "-/-"■ 'f >-'3- 4 fm.^ 



^ V i3 — 4J/J1. $») O 3 — ijin.(\)' ' 



idcoque erit 



aj^^Atang.^ ^-^^'^-''^ ^— Atang. ^ '-^^-f ^ . ; 



Cum porro fit A tang. /> — A tang. ^ — -^-^^ , quia noftro ca- 



fu ell 



-'^ J — 6/m.c^-' • ' y,3 — 4/m.$>i' 



/) g :^ 2jin.(J>f gj i ^ p n 3— /nt.(|>* 



■^ ^ (3 — 5/in.(|)-' ) /(3 — 4jin.:P') r l 3 — Sjin.(P» ' 



confequenter obtinebimus 



wzriAtang. - — —^^fiillil!- ^, ideoquc 



-=* (3 — jm. cp^i > (3 — 4//n. cp*)' 1 



tang. w = ^j.n($^ 



^ (J — Jin.Cp') -/13 — 4j»-i.4>M 



Hoc igitur modo ex aflumto angulo Cp colligitur angulus w. 



§. i6. Porro igitur cum pro lioc cxcmplo fit 

 s =: <7 cof (^-]-l a y''(s — + fin. Cp-) , 



fi cx pundo Z ad rcclam CB ducatur normalis ZX, ct pro 

 Tracloria voccntcr coordinatae CX—.x ct XZ=:,r, lict 

 X — z col. (:) ct j rz c fin. 03, ficquc tam .v quam .r pcr cun- 

 dcm angulum (P dctcrminabitur. Ex tangentc autcm auguli u 

 concluditur 



fin. y =z . ''"^:^\ ct cof. u — ( 3 -//'»• 1>'i >^c» -4/m. $» ) 



j tqy. I^' i i 3 eoj. (f ' V j 



B a Quod 



