Question: The solution x(t) = e-t cos(t) (Section 5.5, Exercise 18) of the spring equation with friction in Section 5.5, Exercise 16. Sketch the given solution

The solution x(t) = e-t cos(t) (Section 5.5, Exercise 18) of the spring equation with friction in Section 5.5, Exercise 16.
Sketch the given solution of the above models of springs first as a pair of functions of time, and then in the phase-plane. Check that the solution follows the arrows.

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