9. Solve the following IVP’s:
(a) y'' + 4y = 4 + δ(t − 3π) y(0) = 0, y'(0) = 1
(b) y'' + 2y' + y = e^t + 2δ(t − 2) y(0) = −1, y'(0) = 2
(c) y'' − 4y = 3δ(t) y(0) = −1, y'(0) = −2
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