\[a(x) = \frac{\mathrm d^2x}{\mathrm dt^2} = -4\pi^2x+x^2\]
\[x_0 = \pi^2,\qquad v_0=\left.\frac{\mathrm dx}{\mathrm dt}\right|_0=0\]
Numeric Integration (or any other method that works )

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*second order*

Now having two initial conditions actually makes sense haha

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