= (17) = 



5t.itnati]r cnim a- =z t' fin. <J), crit -/(cc — xxj = ccoC.(P et d x 

 ~ c d<P col". CP, vnde prodibit 



Quare cum fit S — taug. a^ crit 



dj =:cd(pcoC(p (-"r~?J!,T^)^ ^'"^ 



dy z=icd(pcof.(P taug.la. — Cp). 

 Hic porro loco (p (cribatur a — (a — CP) , vt fiat 



cof. CP = cof. a cof. (a — ^P) -f- fin. a fin. (a — 0) , 

 quo valore fubllituto erit 

 aj' = c-D(p[cof.afin.(a — (p)-^^i:LI^^^^^ fiuc 



dj — cdp [cof a fin. (a — (p) -h ^^-^"^-^,^, - fin. a cof. (a - 0)] , 

 quac aequatio reducitur ad hanc: 



hincque integr.indo eruitur 



r — c fin. a/ ."'^^ -+- c cof. (b-^l;. 



Pro priore membro fit a — (p—po" — w, ideoque 9(P~9(i), 

 critque 



/z;^,=/7^=^^^°S-" = ^tans:.C45»^.U-^I(p), 



quocirca aequatio integrahs erit 



y — b-^c cof (p -+- f fm. a / tang. (45" — J a -h I (p), 



cxificnte x zzz c fin. (J). Sicque pro quouis angujo (|) tam jir 

 quam j* aflignare liccbit. 



ExemplLim 5. 



§. 23. Proponatur pro curuis fecandis hacc acquatlo: 



^ = y |/(<T — .V .r), quac complediiur infinitas eliipfcs fupcr 



hloua Acla Acad. Imp. Sc. T. /. C codem 



