DI BARNABA ORIAXI. Big 



-4-r- = a''- 3 I »'■'([ I ] COS it^ — [ i]^m 2f) 



H.a'V"(6[i] COS 2tco5 6^-^ [3]cos 2£'- 2[i][3]sin 2t-g[ipin 6t) 

 ■*• a.'a"^ (a[^] C05 2tcos 4t-«- 4[ i] cos 4c'- 8[ i] [2] sin ^t - [ifsin 2[)\ 



—jjr-= 2 I a^(i[ij C05 2£ — 2[l] sm 2t) 



•*-2a' a" (3[ 1] [2JC05 2£V6[ I ]'cos 2tco5 4t-3[ I ]'[2]sin 2t-4[i J^sm 4r)\ 



if- <I>t^ 6 r ;> / r n3 a r- -n . \ 



-^-r- = 2 -Sa (2[l] C05 2t — [l]'sm 2t) 



^^ = 2'^ |a'''(3[l]cOS2t^— 9[l3* 5m 2«C05 2t— 2[l]^ C052r) 



•*-2a' a"(3[2] COS 2t-^ 1 8[i] COS 2t*cos 4t- l8[i] [2] sin 2tcos 2t 

 ■-i8[i]"sJn2tcos4t-36[i]^sm4£cos2£^6[i]^[2]cos2£-i6[i]^cos4t){ 



, 3 = 2 ''•5a' (3[l]*cos 2£^— 6[l]^sin 2tC0S 2t — [l]^COS 2 A 



— ^^p- =■ 2 -Sx (3[l]cOS2t''-l8[l]^i/l2JCOS2f'-2[l]\c0S2tV3c0S4t)+[l]''sWI2<). 



Sostituendo uella citata equazionc i valori di 



, d-^e d'-^t^ d^-^t'^ d*-<i>r 



^" -dT ' -H^' -d^' -rfF"' 



ne verra 



V = t-2(x' [,] H- a"[2] -^ a"'[3] ■*■ a"'[4] ^ a'[.5]) 



-+- 2V' [l] cos 2C -^ 2 V* [2] COS At 

 -t- 2Va" ([2] COS 2t -»- 2 [l] COS 4f) 

 M- 2Va"'([3] COS 2f -^ 3[l] COS 6r) 



■+■ 2Va"'([4] COS 2t -i- 4[l] COS 8') 



Vol. IV. p. II. 4i 



