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ODE: A2 DETEST
ID:  92703b225d77aa6c1bfc284217aa6069
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xd0 = -0.5*x0**3
x0(t) = c0/sqrt((c0**2)*t+1.0)
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IVP: 48
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x0 = 1.0
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IVP: 49
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x0 = [0.5,1.5]