CIRCA AEQVALIT. SVPERFICIERVM. 115 



cicm quaeritam pcrtingens. Notandum aiitem efl: 

 efle -i'/V-f-/<^i'^Vz=:— /-^ , ita vt logarithmus 

 ex calculo egrediatur. Verum hic ipgens incom- 

 modum occurrit , quod relatio inter x, y et v ni- 

 mis difficulter expediaturj ex quo aliam folutioncm 

 adiungo. 



AliaSoIutio. 



12. Cum efle debeat rr-i-ss^i^xx-^-jy fta- 

 tuamus : 



xzzvcoi^Pjy—vfm.Cpjrzi^vcor.iA et /— i;fin.u eritque 

 dxz:dvcol(p~vci<pCm.(p et ^'^^i^ fin.Cp+iWCpcorCphincque 



adzzzvdvcoC.^cp-iti^-wd^pCm.i^p -(:}). lam cum fit 



fvdv cof.($-w)— I vv cof (Cp-w) + 1 f<v'u{d(P-d(ii) fin.(Ct)-w) 



crit azznl^vvcoLi^p-iii^-l/^w^dcP-^-diii^^m.ifp-bi) 



quod vltimum membrum integrabile efle nequit , 

 nifi fit i;i;fin.((f)— oj) funclio anguli $)-i-(o. Sta- 

 tno crgo fecundum flgnandi modum iam paflTim 

 receptum , i;i;fin.($-w)i=:F^:($-|-w), vt fiat 



2^2;rrvi;cof. ($-w)-F : (Cj)+co) 



cxiftente d F : (Cp-hw^ — ^^^-^-^/w^F^- (Cp-hu). 



Vel introducantur ajii bini anguli |Ji et j' vt fit 



(Pzz^^ ct oj — ^i^^ hincque habebitur 



v—y 51'J^ ,' x — vcoC(pj jz:zv{m.(P tandemque 

 &azzz:P^^¥ ; ijU 



tang. V r 



P 2 quae 



