x6 \yD R REDy CTIO N E^, 



5,_Simili modo fi ponatur at— ^(^^'feaaj > repefituBr 



— "-*•% z f dz 



6. Ponatur xz=:' y. ;■ - — -^--t, erit</A;=i:-- — , 



yij-i-&zzy ,_,.(/-+- i:sa:)5 



tum « = 7^_— p y(/-i-^^^):=^ ^ ^ ,^^^ 



et y(^^fc^,)::^y^/i-^^f., vnde confi- 



citur : 



x—gxx fdz 



dxV 



h-^{jk-gh)xx {f-{^gzz)\y{h-\-kzz} 



,b-+-(fk-gh)xx fdzV{b ^tzz 



dxv = — : —• Quare 



i-gxx (/-h-^s^;!^ ^^ 



^ zz dz^ — .r^ V ^^-£xx 



{f-^gzz)lV{h-+-kzz) ' h-h{fk'gh)xx 



,dzV[h-hkzz)- ^_, ' ,h-h(fk-gh)xx 



J z-^ — Tzifdxy — - — ■—. 



{J-hgZZ)i 1—gXX 



7. Simili modo ponendo ^v rr y-^-jj—j^ , reperitur ; 

 dz /., , J~kxx 



{h+kzz]lV{f-^gzz) f^(gh-fk)xx 



, dzV(f hgzz) _ f-^-{gh-fk )xx 



{h-^kzz)i -ij^^^y t^kxx • 



