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ODE: Simple Nonlinear 2
ID:  9fb6152e595a7eff1e82d90ab0ab819a
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xd0 = 1.0-x0**2
x0(t) = 1.0-(2.0/((2.0/(1.0-c0)-1.0)*exp(2.0*t)+1.0))
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IVP: 22
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x0 = [3.9,4.1]
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IVP: 23
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x0 = 4.0