334 



APPENDIX. 



d 4 d l _ (/jb 1) b 2 



gives 



" 



- 1 ) 2 (- ^ + 6^ 2 - 1 ) ^ (^ - 2fS+ 5 ) * 



2/^ 2 (M 2 + 1) (- n* + Gy? - I) 4 (^ - 2/^ 2 + 5)* 

 (/i 2 -!) {(,*+ 1) 3 + Oi-- 1) (^-6^+1)} 



2 -l " 2(^-2 



/^ 2+I /-/^ 4 + 6yL6 2 -l\i 

 At a -l ^^-2^ + 5 ) ' 



A 4 4 t ^ - - 



And tan fe + a) = - 



2 (^ 2 + 1) fc 2 - I) 2 (- ^ 4 



(/, 2 -l) (0. 2 +1) 8 - (f- 1) (^ 4 - 6/, 2 + 1)} 

 ^ a +l (- 4 2 -^ 4 - 2 

 " 



