422 P E M O T V 



(latuamus 



A T' == A /' — .r, T' W — y ct /' m' — z, 

 vt habcamus: 



a[z —y) 4- A ( /4-) dxzzo feu adz^zdx—ady-^ydxzzo 

 quae iiuegrata dat : 



— — "^ ?_ £. ^ 



tf» tf ;2 -/"^ * {a dy ~y dx) zze" ay- ifc^y dx --e'' aj-\-z afe" dy 



hincque 



z — t'm' zzy—-- e <^J e°- y dx — —y-^ie « / <?" dy. 

 t)cinde pro fcala ccleritatum oportet fit : 



fl(T'N'-4-;V)-AD'Pi\'-hAD/';j'-_o 

 faciamus .^.,, 



A V-kt^-3i,, ,X'.K'.-J', /'«' =:^, ,;'i,V 



ct acquatio • . 



^ (/ + -) —/v dx-\-fz'fx-o feu ^^/^+ ::^.v4-^^^-j7/.vr o 

 intcgrata pracbet : 



e^a z zzfe<i ( y d^j- q ^y^- - e^ ay f ife^^y dx-e^ay-iaf e-^ dy 

 hincque ;rji. ;;'?((.... 



z-i^r}-'-y-\-''-e 'af t^ ydxzzy— ie a f e^' dy 



vtroque cafu integralia ita dcfiniri dcbent , vt pofi- 

 to A* — o fiat z ■— y. 



C o r o 1 1. I. 



143. Cum cafu , quo tubus in A fl eft aper- 



tus 



