Problems are from Blanchard, Devaney, and Hall, 2nd ed., unless otherwise noted.
[4.3] Undamped forcing and resonance
12. Work it by hand.
Use Maple to plot your the solution of the IVP for t from 0 to 40.
Make both y vs t plot and a phase-plane (y vs. dy/dt) plot.
16. (Beats.) Use Maple to make a plot of y vs. t with the cosine coefficient
=1 and the sine coefficient=2.
[4.4] 6. (Finding forcing frequency that gives maximum repsonse.)
Note: there are 2 cases.