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obliczam f(-x)
f(-x) = (log 2 z (1-(-x))) - (log 2 z (-x + 1)) = (log 2 z (1+x)) - (log 2 z (1-x)) = -1 * ( (log 2 z (1-x)) - (log 2 z (1+x)) ) = - f (x)