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A special class of first-order linear equations have the form a(t)y (t) + a (t)y(t) = f(t), where a and fare given function

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2t ét ys) – et y = e Y(0) = 3 d atl et, y(t)) = et 2t y (tet - Sertat + c y (t) = et + 27 [ tc 3. est cet Y(0) = 3 =) 35 $ +

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