, , , , , , ,
(3.4)
(3.4) . .
:
(3.5)
. . , , , ( ).
(3.6)
. . , , ( ).
.
() . . . . . .
(. 2.4). - , , . ( ), .
(. 2.5): CD, B A E, K L . - - DL , , = 0. b - b LK, = 20 * .
. - KE , 20 - 30 - = 0. = -10 * .
. , .
, (. 2.2), , . , . 2.2, F T = Fr. , .
10