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ODE: Harmonic Oscillator 1
ID:  51916fca24fbc4b52b9abaa3208f512c
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xd0 = x1
xd1 = -4.0*x0
x0(t) = c1*sin(2.0*t)/2.0+c0*cos(2.0*t)
x1(t) = c1*cos(2.0*t)-2.0*c0*sin(2.0*t)
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IVP: 16
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x0 = 1.0
x1 = 1.0
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IVP: 17
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x0 = [0.5,1.0]
x1 = 1.0