In Problems through a third-order homogeneous linear equation and three linearly independent solutions are given. Find a particular solution satisfying the giveninitial conditions.
y(3) + 9y′ = 0; y(0) = 3, y′ (0) = −1, y″(0) = 2; y, = 1, y2 = cos 3x, y3 = sin 3x
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