( 285 ) 



As taiir-^ takos for n = '/o i/3 tlio valiio ^t, wo find 1)v 



1—2 «2 '-^ ' 



means of 



, t/a — 4 ji^ 2 n dn 



I) — 1 — — — - 



d tav- 



1 _ 2,1^ 1 —n^yS — 4 7*2 ' 

 ami, paying attention to the relation fan~'^ 2 \/2 z= tt— 2 tav-'^ \/2 ; 



, 5719 127 \ / 1G9 In 



\15.25u 7.32 / ^ V 15.128 7.1(57 



V. 1/3 

 — ^^ '^ ^ ^-' -dn . . (18) 



In the third place 



7,1/3 



T Cf^ ^'^ A, 7,, 1/3 -4 «3 , , f/^l 47 ,\ 



■' j\-j. 10 7 1 — 2 7(2 V V 2 10 y 



V. V2I/3 



w^l 7, ,«1/0 — 4 71- 3 — 2 7t2 dn 



With dtaii—^ ;— =: 7 — — , we easily nnd : 



1-27*2 1 _„2 j/a — 4 7*2 



,,./, 3 „ 161 47 , 



V.l/3 _„2 ,j4 J ^G 



37 7 , „ r 4 40 ^ 20 



7.5= 71 H tan-^\'2~\ — — dn . (19) 



40 ^ G40 J (1 -7*2)1/3- 4 «2) "^ ^ 



(1-7*2) 



v. 



For 



>/,i/3 



rr2l „ i/a-4 7*°- 39 i/3_4„2n 



* J L5 71 10 2 7* J 



we find by means of 



, 1/3 — 4 7*2 —dn 1/ 3 _ 4 „ü — 2 f/« 



n (1— 7*2)1/3— 4 7*2' 2 7* 1/3- 4 «2 



