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' + 16y = 0, y(x) = A cos 4x + B sin 4x, y(0) = 3, y'(0) = 20 A= and B= (Simplify your answers.)

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