' ■^1.^ ' io6 «^^ 



quo netnpe ipso Iiabebitur 



,a;i. • ^" T-V) = (i — a) Sin fl^ 



fiet utique per difFerentiationem 



~Vi? 



■"^' rfy . Cosln (9 — vj z=z dz. Sin 9, 



d^v . Cotin (6 — r)' '-fi rfy » . Sin — v) = o ,. 



exu • </a . d^v Sin 9 -f- (i —z) dvK Sin 5, 



rfa . d'v -i- (i -^ zj. dv^ = oj- «''^' 

 atque generaliter tandem 



-^ na^s . d * ' (dv'J J 



ubi nempe rf (du') = ^^t,.* _ ^2^^ 



d"" (dv>) = jiyi . a Jy ^ <fj„ , rf,ya ^ ;}^-_ p-. 



</' f'^y'J =jdv^.d*v + isdvd^vd'^tr + (frfiy', ■ 

 d* (dv^)- '-- •-" -^Hdvd-vd^v 



!jdv^ . d^v 

 + iSdvd^v^ 



Ideoque, si, posito quidem /^ valorem exhibere quem obtl- 



net 0, atque — J valorem quem obtinet f -i-^^ pro 3 = 



^ dz" / \ is" J 



