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    - , , - : , , , ( , , ), , , .


     

    , . ( ), ± . , .

    , ( ), , , , . , ( ) , ( ) . 1.

    , :

    tg2() = 2;   tg()=√2 = 54°44',

    , , .

    , , : 


     
    : N - ; R - .

    . , , , > 54°44'. (V) , () - . , , (X) :


    , =0; ( ) tg2() = 2.

    «» , . . , , , .

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