158 MATHEMATICAL FORMULAE AND ELLIPTIC FUNCTIONS 



7.363 





n (n - i) (n - 2) (n - 3) (n - 4) (* - 

 o 



*=- (*-*)(-)( -3) 



n(n- i)(n- 2)(n- 3) (n - 4) (n - 5) 



- 2) . . . . Q - n + i)(2ax) 



(i + a^ 2 )"-/' i (/A - n + i) 403 2 



(n- i)(- 2)(n- 3) /i + a* 2 \ 2 1 



*" 2!(/i - n + I)(M - + 2) V 4^ 2 / ' J 



7.364 



n(n - 



' 



- 2) 



2! 



7.365 



where 



E k = k- -. (k - i) 



I ! 



2. 



2! 



^1 T sin (2 tan-^-^) sin (3 



* ** 



eX 77 ^x cos (2 tan-^-^) 2i cos_(3 



*= - 



4 an 



