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Plot[{LogisticSigmoid[x], Tanh[x], 2* LogisticSigmoid[2 x] - 1}, {x, -2, 2}]
Plot[{LogisticSigmoid[x], Tanh[x], 2* LogisticSigmoid[2 x] - 1}, {x, -2, 2}]
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