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sqrt(e^(2 x) + 1) - artanh(sqrt(e^(2 x) + 1)) -sqrt(e^(0) + 1) - artanh(sqrt(e^(0) + 1)) =2pi
sqrt(e^(2 x) + 1) - artanh(sqrt(e^(2 x) + 1)) -sqrt(e^(0) + 1) - artanh(sqrt(e^(0) + 1)) =2pi
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