As in Exercise 9, consider a spring with mass m, spring con-stant k, and damping constant c

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As in Exercise 9, consider a spring with mass m, spring con-stant k, and damping constant c = 0, and let w = √k/m.
If an external force F(t) = F0 cos wt is applied (the applied frequency equals the natural frequency), use the method of undetermined coefficients to show that the motion of the mass is given by

Fo x(t) = c1 cos wt + c2 sin wt + 2mw t sin wt

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