= CpO 



qmedtae aequalls prodibit, quem ergo cafum feorfim euolui 

 conueniet. Quia igitur tum fit ^" — cof. w et -yizifin.aj, ideo- 

 que ^ ^ -i- yi yj zzz I , formulae pro euoluta ordinis A modo ex- 

 hibitae fcquenti modo contrahentur: 



f'^^ — c e^^ fin. (y -4- X (0 -h -ki 0) 



j<^> — f f^^ [(^ffin.^yH^XwH-^Cf)) — ^cof.Cy^Xw-t-^iCl))] 



,,X) __ _c ^^4> . fin. (^ _|^ X (0 -4- >i (p) , 



/)^^' = ^-^^ f^^ cof. (y -4- A w -+- -vi Cp) , 

 vnde colligitur: 



x'^^^ — /^ f^^ [fin.C|)fin.(y-^-Xu-e:V](:|))— cofC|5cof (y-f-Xw-+->iC|>)] 



y^' — -^ f^^ [fin.Cpcof(y-HXw^>lCp)-f-cof.Cpfin.(y-4-Xu-HV]C|)j], 



vbi notandum tam arcum / quam ambas coordinatas fequeuti 

 modo contrahi pofie: 



jO-' ~ f f^=^ fin. (y -h (X — i) oj -4- ^ 0) 

 j^,X)__ _ _c^?$ cof. (y H- X w -^ (>1 H- i) Cp) 

 f^^ =1 A <?^^ fin. (y -f- X w -t- (>] -^ i) Cp). 



§. 29. llas formulas autem imprimis ad ipfam cur- 

 Vam quaefitam accommodari conuemet, quae cum fe habere 

 debeat ad fiiam euolutam ordinis ;/, vt i ^rt^", ante omnia 

 quaerantur cundi valores anguli o), qui pro fimilitudine di- 

 redafunt:^, — , *-?, — , etc, pro fimilitudine autem inuer- 

 fa: !L, 15, =_? ■LJl etc. pro quibus fcribamus breuitatis gratia 



n'n'n'n' ^' '~' 



u, w^, w'''', ca^'^'', ctc, e.x iisque formemus fequentes formulas: 



^ — a cof. wi 2f^ — a cof. a;^,- <^'''' ~ a cof co''^^ etc 



•VI ~ a fin. wi -vi^ zi: a fin. w'' j ■>]""' ^^ ^ fin- W^ j ^tc. 



Simili modo loco conftantium f et y, quae ipfi angulo w rc- 



lpon« 



