C ^8 ) 



ad inveniendum 5. Porro d-^ N :n S d^ Qj^^dQ^JS 

 ^Q^d^ S Qx. d^ N zz 5' ^* O' — 2 S' f Ql x')^, ' 



XXVIII, 



Uc determinetar B^ est M ^ P S -^ Q^^R. 

 dMzzPdS^SdP-^QJK-^kdQ. 

 Dein dM :=:P' dS' ^S' dF^AdS' JfS' qBdo;? 



_ dM'- y' d S! 



Supra invenimus iV=5 0hinc^^ Nz=:Sd^ Q.+ 3^^^Q 

 -h^d^ S dQ^^Qd^ S ,d^ N':=r2d^ Q^dS'=z6'q^Qdxyd's'' 



et d ^=' 6^^ (^jc;i " ^^^ v^^^^^ ^^ valore .S_ pofids in 

 fuperiori aequatione eric 



^^ ^' 6q^-dx^^ _ ^q d x.dM _ A d^N^ - 



Huius methodi expoficioni addamus praecepta, quae 



tra- 



