Ma č f(x) = [log(1+x)]/(1-x) o f(x) = log[(1+x)/(1-x)]? 
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«Il dolore guida le persone a distanze straordinarie» (W. Bishop, Fringe)
How you have fallen from heaven, O star of the morning, son of the dawn!
You have been cut down to the earth, You who have weakened the nations! (Isaiah 14:12)
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