TRIGOKOMETRIA SFEnOlDICA . I yS 



♦ V' = i3 -H /2' cos 2. Y' -h fc" cos 4 V -t-/3"'cos 6 V'-i-ec. 



(j>V''= y' sen a V -t- ^''sen 4V'H-'/"'sen 6V'^-ec. 



<D V'-'^: ^H- a' cos a V -♦-d"cos4V'-t-3"'cos 6 V'-+-ec. 



ec. 



Sostitiiendo questi valori, otterremo 



8enit=seni{xH-V')r i —-- (^ H ^7 ' '^~ ^\ c r ^-^^^ 



L a a. 0.4 3,3.4.5.6 



-4-sen(i«-t-(i-t-2)V')r i^'— -. /2'-^ 4^ . j''-^ — ll- .J'h- '' ..'-ec 

 ^ ^ ^ ''L a a' '^ a\3 a\3.4 a\3.4..5 



La a a\3 a .0.4 a .0.4.5 



La a a .3 a .3.4 a .3.4.5 



La a a .0 a .3.4 a .3.4-5 



-t-sen(ia,-t-(i-f-6)V')r i«"'-^l . fi'"— H /'-h^L rV-il- /"-ec. 

 ^ ^ ^ 'L a a^ '^ a\3 a^3.4 a\3.4.5 



-Hsen(ittf-H(i— 6)V'i --as ..fl -h__ y -t- d — . „ , ^g — ec. 



^ ^ ^ X a a' a\3 a\3.4 a\3.4.5 



■+- ec, 



Quiiidi facendo successivamente i = a, i = 4» i = 6, ec. 

 si avrauno i valori di sen a t, sen 4 t, sen 6 t, ec. cosicche 

 se, per brevita, poiighiamo 



A=:i_^/3-H4L^__£:^^^ec. 

 a a. 3. 4 a. 3.4.0.0 



T. I. 29 



