3o O R I A N I 



C .(P^r)-Ha/3 .\i]=[-^^{^-^cosjf')'\Ps€np'-^-'-L^enycosp'\[i] 

 se ponghiamo ancora 



n = (P — [i]) coj/?' H i- 



avremo 



a* a. \ senp' 



^6senp'[P{^-*-cosp'')'-'[i]cosp-^]j 



^^Acosp''Up{Z-^iisen{F'-^Py)-8[i](i-^2'Sen(F'-i-Py)-^[o.]J 



^ ' a^ 





e sara 



£.^=,_A_ . ±f^-^^A^cotp'sen{V'-^PYt^^^cosp'cot{V^P). ^) 

 <i/ Jen//' (1/ ^ ^ ' \ dh' d t^l 



^,= a[P-[.]-^P^en(F'-^Pr]co.y(f?-£^') 



— ^cosp'' \Psen^{V'-^P) — senPsen{;:i r-v-P)l(^') 

 vale a dire (§ 80) 



d\ r ,rr, «v,/ , cot V cot (F -^- P) 1 



li: = — A fa«£ A' I — a A ien (F'-H P)\senp' -+- -11-1 ^ '-s 



dK' ^ L ^ «e«/ ^J 



