Find a general solution of the ODE y + 2 y = r(t) with r(t) as

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Find a general solution of the ODE y" + ω2y = r(t) with r(t) as given. Show the details of your work.

r(t) = π/4 |cos t| if -π < t < π and r(t + 2π) = r(t), |ω| ≠ 0, 2, 4, · · ·

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