題目： Let A = [0 -4], y(t) = [y_1(t)] , y''(t) = [y_1''(t)] . solve the
[1 5] [y_2(t)] [y_2''(t)]
system y''(t) = Ay(t) by the matrix method.
Sol: A 之 eigenvalue : 1 , 4
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=> X_1'' = X_1 => { X_1(t) = c1e^t + c2e^-t //***
=> X_2'' = 4X_2 { X_2(t) = c1e^2t + c2e^-2t //***
問題： 我想請問各位大大 ***的運算式做二次微分怎麼計算呢？？ 煩請解答 感謝
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