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3. , ,
3.7., , . ( ) ( ). () , , . () (. 3.19). , , * . * , ( ) ( ), . 3.19, (I) (I): I = I. (3.7.1) 3.19 , . .
3.19 , . . iO = iA + iB + i. :
(3.20, ) . (), cos φ = 1, (φ = 0).
() iO = iA + iB + iC = . , . . . , , . ( ) , . , ( ), .
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