— 153 — 



2) 1 + 2- 



b^c , b^c^ , b*c6 , b^c 



4! 



b^c 



+ -ir- + 



(n— rin 



b^c~T^^ 



bc 



24-bc- 



2bc2 



3+bc2— 



3bc-^ 



4-f-bc3 



4bc* 



5-fbc4- 



5bc= 



6-i-bc^ 



(33) 



(n— llbc 



n— 1 



n-j-bc 



4) q-j-qf cos ^^q^^-^ cos 2y +q®^-^cos 3^+q^°^-^^ cos4 ^ + . 



n(n— l)f— 2n(n-2) 



. . + q 



cos(n — l)r/) = 



f-i 

 q cos 9p 



l-f-q cos (f 



2f-3 



q cos 2 9p 



< 2f-3 



COS 9f + <1 cos 2 9p — 



3f-5 _ 



q cos v^ cos 6 f 

 COS 2 9? 4- q" cos 3 9p 



(34) 



(n— l)f— (2n~3) , o^ / 1\ 



q cos(n— 3)9PCOs(n— 1)9P 



~ fn-Dt— (2n-3j ^ T" 



cos(n— '2)w-|-q cos (n— 1)9? 



