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«^i terms the cofinc (funi « — i arcs — i arc) (B) 



_^ ^.'-JL _^ terms the cofine (fum n — 2 arcs — fum 2 arcs) (C) 



I. 2. 



« — I. W 2 - « »J r //- e ' 



— terms the cofine (mm of n — m arcs 



- fum m arcs) (H) 



n — I - - n — m — i 1 .- //• /- 



terms the coune (mm m arcs — fum 



1. % - m — I. 

 n — m arcs) (H') 



n — I terms the cofine (fum a arcs — fum n — 2 arcs) (C) 

 I. term the cofine (i arc \a) — Sum n — i arcs) B'. 



Now if the arcs be all taken equal, all the Bs are equal to 

 each other, all the C', &c. &c. and alfo B = — B', C = — C 

 &c. &c. and confequently cs, B = rx, B', cs, C = fx, C', &c. &c. 



♦.• n — I. - n — m ^^ n — i - n — m — i tj/ 

 I. 2. ' OT I. 2. 3 - m — I 



■=171. n — I - - n — m — i 



cs. n — 2 m a. 



I. 2 - - CT 



Whencs 



