Re: [理工] [工數]-高階ODE
※ 引述《littleyinyo (I AM YIN)》之銘言：
: 有一題很奇怪，怎麼積就是積不出來
: x^2y''-4xy'+6y=x^2sinx
: 題目是98年高應的考題
令 x= e^t t = lnx
去做做看~
Dt(Dt-1)y - 4Dty +6y = e^2t sin(e^t)
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