Forza motrice 35 



2n- 2ff 



~2^J J ^^^^^^^ — //)sin9sinS.l5.z' 



2ff 2fl- 



==T ^./ ./ ''^'^^ ''"^ s'nHi//(?' - ?"')] 



2ff 2 



ff 2ff 





2 «^ , . 

 = 1 5/anm'7r^.sinX.cos^X 



2«- 2ff 



2ff 2jr 

 = — — -^/ f dfi9cos(pcos0lqf{q'^— ?"^)] 



^ *^ o 'o ' 



2ff 27r 



15 yti?^/" /• r 

 = '-J- I I d(pd9.2mm'cos^ipcos^9 



«= — 1 Sk.mm'n^. cosksìn^ A ; 



2ff 2ff 

 &J fà^à9{gq -/rK.15^' 



27r 2ff 



15 

 2a4 



f9{p-r)ffà^^^-^^"q'i' 



In 2ff 



= -fg(p— g^)nmkf f<ì(pd9[.dn^<pcos'9+sìu'0cos'(p'} 



— 1 S.tom'Ti^.sinX cosX(cos='X — sin^X) ; 



