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ODE: Harmonic Oscillator 2
ID:  37bb61e77465620888c097647c5719ea
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xd0 = -x1
xd1 = x0
x0(t) = -c1*sin(t)+c0*cos(t)
x1(t) = c1*cos(t)+c0*sin(t)
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IVP: 50
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x0 = [0.0,1.0]
x1 = [-1.0,0.0]
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IVP: 51
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x0 = 1.0
x1 = -1.0
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IVP: 74
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x0 = [0.0,0.1]
x1 = [0.95,1.05]