, . . :
1. ;
2. ;
3. .
, : 1, 2, 5, 10 20.
. , (. 98, ), ℓ .
φ ℓ
. (68.1)
1R1' ,
Rsin φ;
y 1 = R Rsin φ = 2R .
, ln,
φ = φ; (68.2)
xn = Rsin φn; (68.3)
. (68.4)
. 98. :
; ;
( ), . , () .
, , , , (. 98, ). l (68.1), φ. δ :
.
(68.2) (68.4), - :
.
, . δ Sn. .
u . , , , .
l, φ /2 (. 98, )
,
.
. φ /2 l 1, . 2(φ /2) 1 l , 2 . .
|
|
, , . .
, , , . , .