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[(1+tanh(x/2))/(1-tanh(x/2))],[" (A) "e^...

[(1+tanh(x/2))/(1-tanh(x/2))],[" (A) "e^(-x)],[" (B) "e^(x)],[" (C) "2e^(x/2)],[" (D) "2e^(-x/2)]

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