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===Hyperbolic tangent{{anchor|tanh}}===
The hyperbolic tangent is the (unique) solution to the [[differential equation]] {{math|1=''f'' ′ = 1 − ''f'' <sup>2</sup>}}, with {{math|1=''f'' (0) = 0}}.<ref>{{cite book |title=Nonlinear Workbook, The: Chaos, Fractals, Cellular Automata, Neural Networks, Genetic Algorithms, Gene Expression Programming, Support Vector Machine, Wavelets, Hidden Markov Models, Fuzzy Logic With C++, Java And Symbolicc++ Programs |
==Useful relations==
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