. 



II DE SUCCE S S I VA MUTATIONE 



XIV. 



Prima difFerentiatio , qua.anguli 4 & a conftanres 

 & d^ = d q fumuntur pra:bet : 



dX=- — v d$ {fin. £ cof. 4- -t- cof. £ cof. a fin. 4) ? 



dY — vJip (fin. %fin. 4 — cof. £ cof. a> cof. 4 ) 5 



dZ = -t- v d <p cof. %fin. a. 



Altera autem difFerentiatio hos fuppeditat valores 

 dX= — - — vd% (fin.'£,cof.-\,-*~cof.£ l cof.u,fin.-\,) — v 

 ^4 ( co f- %fin- 4 +fi n - ? cof. a cof. 4) -t-vda>fin. ^fin.ssfin.-^ i 

 dY — — - — v d% (fin. Zfin. 4 — cof. % cof. a cof. 4) — vd-\> 

 {cof £ cof. ^—fi n . £ cof. a fin.-]) — v dm fin . Zfin. a cof^, i 

 dZ = — - +■ v d | cof %fin. a>-\-vd a fin. £ cof a. 



Hinc squads poftremis formulis pro dZ invencis col- 

 ligirur. 



j , ,. da fin. % cof. a 



* {of. ? fin. m 



XV. 



Quo facifins relario ex prioribus orinnda eficiatlW, 

 confidwcmus has formulas indc derivatas 



