Show that the phase plane trajectory of the solution of the differential equation [frac{d^{2} x}{d t^{2}}+x=0] with

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Show that the phase plane trajectory of the solution of the differential equation

\[\frac{d^{2} x}{d t^{2}}+x=0\]

with initial conditions \(x(0)=0\) and \(\dot{x}(0)=1\), is a circle of unit radius centred at the origin.

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