[理工] [工數]-簡單ODE的問題 跪求~~~
只能怪自己複習不夠徹底~~
題目:
y"+ 2y'+ 5y = 16e^x + sin2x
令 y = A e^x + B cos2x + C sin2x
p
請問為何多1個cos2x 呢?
之後我會算 但是我令錯 我令成
y = A e^x + B sin2x
p
想請問要怎麼那個"令"之後要怎麼看
是本身和微分項都要令嗎?
那 指數的微分項是?? 沒有嗎?
記憶一直衰退耶=.=
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