TRIGONOMETRIA. SFEllOIDICA. 1 Sq 



d P= d V fi -t- ^ A' cos p'-sen V — — A^ cos p'-* sen V-* 

 La 2,4 



-^ l±^ A*cosp''senV'— eel 



Ora abbiamo gia veduto sopra (§ i6) la forma dell' 

 integrale y tl V sen V^"; facendo pertanto 



Q'= -, A'cosp''— -il— , A-'c03p'-»H- 4^—1— A^COSp'* !""', ^,' lxA'cOSp'^-H CC. 



2.' ^ a\4' *^ a'.4\6' ^ a\4\6'.8' ^ 



= -5Q— o--^ COSp' 



Q"'=4Q"-Hj.i:lA^cosp'^ 

 5 5 a.4 "^ 



=: - Q — A' COS p' 



7 7 2.4.6 



ec. 



risultera 1' integrale 



P-HC05fa/ife=(i-+-Q')V— Q'senVcosV— Q'senVcosV— Q"'senV'cosV— ec. 

 Quindi facendo come sopra (§ i6) 



R' =2: -H-^ q: -. ^J . 2Z ^ ^^ . q: -H ec. 



a I a^ I. a a" 1.2.3 a 



a^ I 2^ I. a a' i.a.3 a' 



V 



-+- ec. 



^.„ Q'" 6 Q'" 6.Q Q' 6. 1 0.1 1 Q^' 

 a 1 a 1.2 a^ i.a.3 2 



ec 



