X 63 )( 



du r (XfA^ — XV) 4- (|Vv — ^v') cos (^ 4- (v^X— vX') sen (p 



cos-u ~ { x cos <^ -j- y. sen <p -\- V ]'- 



e conseguentemente 



d<^, 



, _ (Xfx^ — xV) -}- (g^— fAv^) COS (p -{- (v^x — vV ] sen (p 

 " ^ ( x'/ cos cp -f- fA^/ scn <p -j- v'/ )2 ^* 



Da ultimo essendo 



£ cos uj = P 4- Pi cos A + 1^2 s^n (p 



X" cos cp + fx" scn (5 -|- v" 



Ksenc.= Y + r. cos^ + r.. sen<^ ^ 

 X" cos (P -f- ja" sc/i cp + v" 



risulla manifestamente 



/'Esenuj\' __ (y + Ti co-scp + yoSf/ìtpj'fx^/cosCp -|- fA/^sg?ì(p -f-v//) ^'' 

 V~H~ y " (4 cos-tp + B sen-(i + (7 )' 



/'KccsuA'-'- _ (/34-p,cos(p4-i3,sen(p)'-'(x/Vos(P+fx//se«cp+v//)-('- 

 \ // ) " ( 4 cos-(p + B sen^ -j- C )'-^ 



v) -f- 'Il cos tp + n., «<''!'? + 



'•) 



CCSJif = 



( \" CQS (p + sen (P 4- v'^ )' 

 du { ^ -{- ^i cos (p -{- 1?, S'"'' ^ ] # 



?^^ (x//cos$4-[A//sen(p+v/') J/^A cos-(p+Z/sm-(p+C 



Laonde troveremo 



„ __ r* ( x^/ cos (^-{-fj." sen (^+v" )'--''- * F( cos^p, scntp ) rf(p 

 ~ J _* (vi cos-<p + i? sen^cp + C ) '+'(, ' 



