In Exercise, write a function ODE file for the system. Solve the initial value problem using ode45. Provide plots of x1 versus t, x2 versus t, and x2 versus x1 on the time interval provided. See Exercises 1–6 in Chapter 7 for a nice method to arrange these plots.
x1′ = x2 and x2′ = -25x1 + 2 sin 4t, with x1(0) = 0 and x2(0) = 2 on [0, 2π].
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