show, by direct substitution, that the given functions y1(t) and y2(t) are solutions of the given differential equation. Then verify, again by direct substitution, that any linear combination Cy y1(t) + C2 y2(t) of the two given solutions is also a solution. y'' + 4y = 0, y1(t) = cos 2t, y2(t) = sin 2t

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