In Problems through, express the solution of the given initial value problem as a sum of two oscillations as in Eq. Throughout, primes denote derivatives with respect to time t. In Problems, graph the solution function x(t) in such a way that you can identify and label (as in Fig.) its period.
x″ + 25x = 90 cos 4t; x(0) = 0, x′(0) = 90
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