Suppose an undamped forced spring mass system is driven by the equation + 9x = f(t), dt where the Fourier series of a function is given by f(t) = cos(6t), for -π ≤ t ≤ ñ. Let ∞ x(t) = Σ An cos(nt) n=1 be a particular solution. (a) Find A₁. (b) Find A6

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