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Transform the equation u + 4u' + 7u = 9 sin 8t into a system of first-order equations by making the substitution I1 =

Transform the equation u" + 4u' + 7u = 9 sin 8t into a system of first-order equations by making the substitution I1 = u, 12 = u'. Write the result in matrix-vector form. dt 12

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