Question: In each of Problems 23-30, a second-order differential equation and its general solution y(x) are given. Determine the constants A and B so as to

In each of Problems 23-30, a second-order differential equation and its general solution y(x) are given. Determine the constants A and B so as to find a solution of the differential equation that satisfies the given initial conditions involving y (0) and y' (0).

y" + 4y = 0, y(x) = A cos 2x + B sin 2x, y (0) = 3, y'(0) = 8

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