[ 42 ] 



+ 



n — u \- I . « — K + 2 



I. 2. 



ti — I 



2 



U — I 



to terms «— « v n—u 



? 2 s,a X cs a. 



K 4- r 

 + when is odd and — when even. 



Let n be of the form 4/, p being any number. 



The fine of 4/ X 0,~i = (becaufc 4/ O is a multiple of the 

 circumference) = fine of — ^pa=—s, /^p a .-. when n is of 

 the form 4/ the general term of the fine of « a = + 



» — u + I 



+ 



U 1 



^"^ "IT terms n-iT^n-u 

 — ■< 1 Sf a xcs a — when 



u 1 



I. 2 



is odd and + when even. 



2. When « is odd. 



The general term of the cofme of « x Qj-a = (II) 



ti 



2 



+ 



«. n — u + I. « — u+ 2 



I. 2. 



u 



2 



to 2 ^^^^^ n-u-i 



2 fJ QlI7\ 



n—M 



Let « be of the form 4-p + i. 



The cofine of 4/ + i x O; — a = es \p 0_+ Q7— 4/' + i a = 



</, Q7-4/ + I ^ = fine 4^ + I ^ .-. when « is of the form 4/ + i. 



the 



