Qunm fgitur nunc fit: 



/dtrin.tfV dtz=-coC,t/Vdt-\-fVdtcoT.t; 

 /dt cof, tfV dt — {\xi,tfVdt -fV dt fin. f , 

 ifta exprefrio pro a' , in hanc abibit : 



u'zi:-2.fV dt-\- cof f /^ ^ (2 V cof. r -H U fin. t) 

 -f- fin, ?/ </ ; (2 V fin. ; — U cof. t), 



f. 9, Porra quiim fic 



i,d du' -^dt d V -6 u* dt^z=- z\] dt''\ et 



3 ^f ^Cp^H-^w^^/^rr- 3 dt^fV dt\ 

 his aequationibus additis prodibit: 



zddW -dtd(p'z=:- nV dt'-^ dt'fV dt, 

 ideoque inttgrAndo ; 



i d u' - (^' d t -zz - z d t/\J dt - z d t/d t/V d t y 

 fiue 



Cl>'=3/^//Vr/r-i-2/Ui/f-h'4^. 



Atqui ex aequatiunibus: 



du'cof.t-{-u'dtfin,tzz—dffVdtcofj-2dt/dtcor.t/Vdt,^ 



du' {ix\. t - u' d t cot t — ~ dtj\} d t f\v\j - zd tj d t fiw.t/y dt., 



multiplicata priori per cof. / et pofteriori per iin. /, ea- 

 rumque capta fumma,. prodibit-. 



'-5-r;=-2coff/U</^rcor:r-4Cor//^?cof;/V<//; 

 - 2 fin. tjUdt fin. r- 4 fin. t/a t fin. ?/V df^ 

 qu^e per fimilem redudionemi ac fupra,. reducitur ad hancr 

 '-ff = 2 cof ^/^ ; (2 V fin.. r - U cof r ) 

 - 2 fni. t/d t U V cof. t -f- U fm. r). 



■■> ;i^;-': t' . 'JOlJv, orj^i %0;' 



Zz 3 Ideo- 



