84 ELEMENTA 



tum vero po-utur /( A — W)£^a; — 2B , cafuque x::a 

 fiat Si$ -r 5( , q«o fido erit : 



(P)=i:P-f-(A-W)q>4-(5l^^^P 



(Q.)r:Q_-f-(A-W).a-+-(5(-2B)a 

 (K}iz:R4-(A-W)Dl-|-(5(-3B;r 



etc. 



Cafus V. 



58. Si 2 contineat ipfam formulam O—fZdx, 

 \t fit: 



dZ^zKdO-i-Mdx-^Ndy-^-Vdp + QJg-i-Kdr+etc. 

 ponatur /Kfl^A' — V, et fido xzza^ fit V — C, erit : 

 (N)-^c-VN ; (P)i=^^-^Pi (Q)::re^-^qi(R)=f^-^Retc, 



Cafus VL 



59 Si 2 praeter formulam 0~fZdx contineat 

 aliam formulam integralem Hr^zJ^^dx , fitque : 



dZ — KdO'+-LdnH-Mdx-{-^dj-^Vdp-h-Q^dq 



-{-Rdr-i- etc. 



tum vero ^ nullam formulam integralem inuoluat : 



J^-^^dx-h^dj-h^c/p-^-OJq-^dldr+ttc, 



fit jKdx — W^ et pofito x—a, fiat V — C. Deinde 



fir fe^-^^Ldx^iW, et pofito xzza, fiat W=:A , 



eritquc : 



(N)=^^-^N-4-(A-W)g^ 



(P^rr^^^-^P-i-^A-W)^) 



(Q)=fC-VQ.-+-(A-W)0 

 (R) — fC-Vi^_^^^_^j^ 



etc. Caliis 



