**4 DE PHAEN. MOTVS TERRAE DIVRNI 



vbi primum obferuo ,. fi vires perturbatrices litter* 

 V zz 2 -f/^ contentae euanefcerent , binis prioribus ae* 

 quationibus fatisfacere has formulas yznbcoLaft et 

 zzzb&n. aft praefenti autem cafu quantitatem h 

 euanefcentem accipi debere. Quare cum ob quanti- 

 tatem V particulae quaedam ad hos valores y et % 

 accedant , has ipfas particulas inueitigari' conuenit , 

 quibus deinceps reie&is illis membris litteram b in- 

 volucntibus ; erit \tendum. 



XXIX. Hunc in finem autem opus eft ante 

 omnia fbrmulas cof.^cofvj et cof.^cof. euohu, vn- 

 de fadta reductione repcritur : 



cof.#:of.^fin.f f-fin./fin.Cj)fm.2(^vP)-fin./cof/cof.$-fin./cof/cof(J)' 

 | cof.2(?-^) 



}.+tang.efm.7 2 cof.(J)fm.(2^— ^— &>)-^-tang.e(in./ 2 cot.cI)fin 

 4 (vp-u)+tang.ecof/fin.Cj)co(.(2^-^-w)i 



I -tang.ecof / 2 cof Cpfin. i 2^- vp - w)-tang.rcof ^cof.Cpfin | 

 ^ (vl/-w)-tang.ecof/fin.Ct)cof.(v^-w)j 



omiflis terminis quadratum tang. e* implicantibus 

 vtpote minimis ; quam ob caufam pro fin./»* 

 ■^,+ta ng.Sjin.iq-^ etiam vnitatem fcribere Ucet. 

 Hinc etiam angulo <p in finus et cofinus fimplices 

 inuoluto , adipifcimur : 



4Cof£cof.*)— — fin.2/cof.Cj)-fin./cof.(C[)-2^-r-2v|y)-|-fin./cofCCl)-f-2^-2^ 



-fin./cof/ -fin./cof./ 



— tang.ecof2/fin.(Cj)+2^-vp-w)+tang.ecof 2lfm.((p-2q-{-\\/-{u 

 4- tang e cof. / + tang. e cof / 



^-tang.ecof.^/fin.JCp-vly-l-w^-tang.ecof.^/fin.fCp-i-vp— w) 

 — tang. e cof. / — tang. e cof. / 



vbi 



